Has Global Warming Happened Before? Earth's History With Climate Change

[@FahadAshraf1995]

I think something that would really help when trying to visualize this is to have a timeline playing across the bottom that kinda shows where you are in regards to Earths history

[@ricktd6891]

They won't show that because you would realize you're living deep within an ice age and there's no chance "global warming" could be a problem when the planet is historically cold.

[@ValeriePallaoro]

@@ricktd6891 That's his point; while we should be in an 'ice age', we are not. More to the point we are sooooo not that the earth fluctuations can't bounce back. With out us being wiped out, this warming will continue. Not my problem, I'll be dead soon; but it's certainly gonna be someones problem.

[@martingetz3675]

@@ValeriePallaoro I think he said we ARE in an ice age. Meaning there's ice at the poles. We're ok. Settle down. CO2 isn't destroying the world. It's helping plants grow.

[@Angelinay-vw6dw]

Martin Getz He was referring, to the prospect of ice being existent at both poles. We are not in the concept of an ice age in which you are idealizing. Existence in itself, most incomprehensibly sick, is thoroughly likely going to be of eight degrees Celsius of warming: - analogous, to preceding the disgustingly insignificant collection of beings, which humanity is, imposing a converted world - in proximity to this one hundred years’ cease. It could never ever be comprehended by every, and all being - the incomprehensibly, too ingrievous to ever, to any senses at all, ever grieve, horribly miserably horridly, heinously, sickening concept of what a converted world- comprising of, in, incognizably horrendously,endlessly excruciatingly, stomach-churning, most sickening absolute apparency, the concept of existing in its entirety. Existence in itself if likely - most, incognizably, tormentingly, neverendingly, putridly sickening - disgustingly, certain - to cease, in the conclusion of humanity; and be ceased, absolutely utterly, inconceivably hideously incounterably ceaselessly. nymag.com/intelligencer/2017/07/climate-change-earth-too-hot-for-humans-annotated.html www.sciencealert.com/scientists-say-it-could-already-be-game-over-for-climate-change?ignore_amp www.google.com/amp/s/www.nytimes.com/2018/12/07/science/climate-change-mass-extinction.amp.html amp.theguardian.com/environment/2018/dec/06/global-warming-extinction-report-the-great-dying

[@ceilingwasp1883]

@@martingetz3675 lol

[@sritanshu]

Remember what George Carlin said,"The planet is fine, The people are fucked."

[@Bauks]

My thoughts exactly ..the earth ain't going nowhere ...we are...pack your shit folks ....

[@impalabeeper]

+Bauks Yup, I'm learning what I can on living in Mars by watching the survival doceumentary The Martian ;)

[@Ashzeriam]

+dammit dan unfortunately people living today will, and have, experienced some of the consequences of climate change. It is no longer our kids problem. It is our problem.

[@Scottar50]

+Sritanshu Sinha He was my favorite stand up comic too, great stuff and he was basically right on his insights.

[@hg2.]

Absolutely. Climate quackery is not about science, it's about power, taxes, empire building, careers, human sacrifice, and trumped up superstition.

[@MilwaukeeAtheists]

A snowball earth? They should've called it a snowglobe. They missed out on a great opportunity

[@menelik_]

shower thoughts

[@videogyar2]

Scientists are naturally bad at naming things.

[@alexv3357]

Chemists and physicists are particularly bad at it

[@paulschlegel4543]

Milwaukee Atheists o

[@fagica]

Rosebud.

[@RayWachFP]

Please do a follow-up to this video: what do we know five years later, has any of this changed? What additional knowledge or theories have developed since this video was made?

[@joejo4549]

If you look at records of temperature, last decade is top 10 all time recordings i believe. So every year is getting worse! I'm not sure if they mention this but a big risk is if the oceans ability to act as a heat sink becomes saturated (more energy is required to heat water then air, so it reduces atmospheric temperature rise) we'll see major accelerations even further

[@muskmadness1]

@@joejo4549 How can you say every year it's getting worse as since 1930s US hasn't had hot summers, and more so, as Indians in India we arent even seeing any drastic temperature change or drought conditions, rather earth is getting greener due to more CO2 in the air. Climate hysteria is really eating our minds. We should nonetheless be mindful about our waste management and energy consumption. But scientists still aren't 100% sure how much of global temp rise is man-made and how much of it is natural. Climate is a very complex subject and a few computer models cannot ever give an accurate prediction. I trust climate scientists as much as I trust fortune tellers.

[@joejo4549]

@@muskmadness1 I'd rather trust facts and scientists then random morons on the internet. Look at the frequency of extreme events, especially in tropical regions for examplen and world temperature graphs.

[@muskmadness1]

@Joe Jo ofcourse you can give in to their "computer models". Science can never be definite and only a fool will think otherwise. These very scientists claimed that we will have 50 million climate refugees by the year 2000. These very climate scientists take 2 to 3 flights per year on average, a study by Nature Journal. Climate scientists fly more often for work than their peers. I'd rather trust reason instead of hypocrisy.

[@rosslomath]

​@@joejo4549what's your basis of credibility... how much money is thrown at it 😅

[@martinwilke1980]

The asteroid that wiped out the dinosaurs was not 200 km wide. The asteroid was about 10 km wide. It's the resulting crater that is about 200 km wide.

[@ecoop20]

Martin Wilke I was looking for this! Thank you!

[@joevenuti1201]

He also mentions "greenhouse gases" like methane and CO2 but never mentions the ONLY important greenhouse gas, water vapor. Other than this bias he presented the earth's history in a fair, even handed way.

[@craigkdillon]

@@joevenuti1201 Nope. You need to do some more reading. Like the old saying, a little knowledge is a dangerous thing. You need just a bit more.

[@ericclaeyborn8359]

The worldwide flood of Genesis wiped out the dinosaurs. It's funny, how evolutionists think an asteroid knocked off the dinosaurs, yet, the fragile butterflies survived it.

[@pandalm7797]

@@ericclaeyborn8359 And cuz the earth is flat all the water from genesis could just flow off the earth.😂

[@deandradegois]

thank you guys! it's comforting to know that in the US a scientific show have so much viewers. friendly brazilian salutes from italy! =]

[@antlant329]

The thing about global warming isn't that it's ruining the Earth. The Earth will do fine. We, however, might not be fine.

[@Dank_McMeme]

but don't you see?!?!!?!?!? do you not understand?!??!! WE ARE THE EARTH RICHARD!!! -falls to his knees and looks down- And the earth is doomed. Na I'm just trying to be funny. I failed. But humans may soon be able to control the climate soon enough with our advances technology.

[@jnyerere]

multimagictutorials "humans may soon be able to control the climate." Based on just common knowledge of how the planet operates, nature ALWAYS wins. Humans are so damn arrogant that they think they can control everything. But at the end of the day, we are a pest that the planet can easily and swiftly rid itself of.

[@Dank_McMeme]

CzarJuliusIII remember, control is a human made word, with a human made definition. So humans technically control control. Since control is derived from human thoughts and hypothesis and invented by us as well, we control everything within the boundaries of this solar system. One day we will put a colony on the moon, then mars, put space stations all over the galaxy and every moon simply because the earth wasn't big enough to hold us all. We would be so advanced at control and innovation, we could easily control the climate with many different types of concepts.

[@shnlj5910]

CzarJuliusIII I think us purposely modifying the climate is dangerous. There is no free lunch. Good weather somewhere means terrifying weather somewhere else. Who decides who gets tropical paradise and who gets daily F5 tornados? First thing we'll do is weaponize it anyway so politicians can use it against everyone else. Vote for me or there will be a constant hurricanes. They'll call it democracy.

[@rogerramjet5092]

Agreed people say "save the planet" the planet will be fine. We on our worst day lack the ability to destroy the planet. Now are the conditions that exist conducive to human life are another matter entirely. I like to ask"Are we smarter than yeast?", the reason wine and beer have an alchol content of 4-5 percent is that's the concentration at which they killed themselves off poisoned their habitat and died. But that only applies if we are responsible, if not, it doesn't matter.

[@octavianova1300]

I believe when the earth first formed the sun was 70% of its current luminosity, not 70% less than it's current luminosity.

[@RezoJaco]

7:00 I think there is a mistake there. It could not had been a 200 km wide asteroid. The Chicxulub crater in Yukatan is roughly 200 km in diameter. The asteroid/comet was around 10-15 km wide.

[@paulsmith1981]

The entire presentation is based on models that are contradicted by the actual data. What does it matter.

[@roblouw3038]

The largest impact site on earth is right here in South Africa - 400 km radius right through Johannesburg and Free State - so comical that this massive influence is not even mentioned in the video - talk about fake news......

[@mattm597]

Yes. Good catch. The actual asteroid was a few miles wide--roughly the size of Manhattan Island.

[@haroldburrows4770]

I wondered if I heard this fellow right, big diff in 10 and 200 km

[@LynxSouth]

@@roblouw3038 A 400 km radius? As in an 800 km diameter? Is there a name I can use to look this up? I'd read a huge something had hit S. Africa, but ... yeow!

[@AlcyonEldara]

And I wanted to add something : I often hear "tiny humans cannot changed something as big as the climate on a whole planet". Several billions years ago, small bacterias were polluating the atmosphere with dioxygen,, starting an Ice Age and the extinction of many species. But I guess that the bacterias are stronger than we are.

[@Scottar50]

+David Sbabo Yes, in numbers. And a tiny weeny virus can ruin the rest of your life chump!

[@donaldanderson6716]

David Sbabo that's a gross over simplification. I find it hard to believe that after every thing we have introduced into the atmosphere we haven't changed something. With that said I believe that humanity will overcome the new challenges that stand before us as we have been doing for some time.

[@hondaguy9153]

Donald Anderson I believe he's being sarcastic.

[@AlcyonEldara]

Of course this is a sarcastic over simplification :) Of course we already changed the climate :)

[@donaldanderson6716]

David Sbabo I do apologize but I fail to see the sarcasm with exception to the last sentence. Saying the ice age was brought on by small bacteria is the statement that I am addressing as over simplified. As I understand there were a great deal of factors that contributed to the Ice Age.

[@spiderjuice9874]

7:57 So, Greenhouse Earth at the thermal maximum, where no ice existed at either pole, is "an ideal climate for warm-blooded creatures like us mammals"? Hmmm. You do realise that temperatures were higher than today, and that CO2 levels were also higher? If that was the ideal climate, then what's all the fuss about nowadays?

[@nikkidarkangelpnope8400]

Taxes

[@sodalitia]

"ideal for warm-blooded mammals" - mammals of the Permian period, that were different. Most of them were small and living in burrows, to escape heat. Also they had millions of years to evolve and adapt even during Permian mass extinction event. If lets say 55 C is no big deal, why in Europe last summer 100,000 extra people died of heat strokes? You see, the problem is not that it never was as hot. The problem is the rate of change. Animals can't simply evolve fast enough to keep up with the rate of current global warming. How is 1 bln mammals in Australia, burned alive in bushfires, doing in this "ideal for warm-blooded mammals" climate?

[@nikkidarkangelpnope8400]

@@sodalitia Mega Fauna & Mega Flora it's a real thing. Also arson and shitty land management are not climate change. I would know the same thing happened in British Columbia for the same reason we ousted the liberal government put the money back in forest maintenance and shocker many less fires the next year. You need to learn how to determine objective fact from subjective opinion.

[@DaDudeClub]

Uhm no, CO2 wasn't higher. kzbin.info/www/bejne/eHfHgZ6cdrd6pdk

[@yap5995]

Same old 'scientists' without facts trying to say the earth is warming

[@kronickarmakaziz5851]

Funny how there are always more organisms alive when the planet is warm and less when it's not. It's almost like being warm is a good thing...

[@sternamc919sterna3]

The warmer climate allowed the development of farming and animal production in settlements, and increasing human populations. Hunters/gatherers were nomadic, always following their prey and moving to find fruits, roots, seeds and greens.

[@otters72]

That was fantastic Hank & SciShow crew! More like this, please!

[@raybo64]

The reduction in atmospheric co2 FOLLOWED temperature reductions, not the other way around. Co2 is a very, very, very minor atmospheric gas contribution to the greenhouse effect.

[@hernanposnansky4830]

kzbin.info/www/bejne/qnKofXqpZtB-qbM

[@fudgedogbannana]

Yes, methane is a much more efficient greenhouse gas but too much co2 can be a problem too.

[@donaldevanshennings7732]

@@fudgedogbannana Methane only has a short life before reducing to CO2 and water. The CO2 is good for plants, plants are good for herbivores, herbivores are good to eat.

[@Unb3arablePain]

So let's go over what we need to do children: -Start using nuclear, solar, wind, geothermal, etc. energy sources that are clean and don't emit greenhouse gasses. Everywhere. F**k coal and natural gas. -Get all of the old & polluting automobiles off the road everywhere. I bet about 80% of the pollution is caused by about 20% of the vehicles. Get rid of those vehicles, and start using more efficient cars with hybrid tech. We can still manage to use fossil fuels in transportation okay if we can get the newer, much less polluting vehicles on the road. -Try to make trains a thing in the US. Seriously, the trucking industry is sooooo inefficient compared to trains. -Plant vegetation everywhere. Have the rooftops on building be plants. Plant trees all around the houses of people so they can be cooler and use less energy.

[@jumhuriyyah7266]

Who the hell censors the word fuck

[@jumhuriyyah7266]

And this is a lot more complicated than you'd probably like to think

[@qgames5102]

fossil fuels only account fir 49% of greenhouse gasses, so what we should focus on is reducing the 51% which is livestock

[@kimberlydrennon4982]

+q games We should focus on both, because they account for almost 100%. +1 for pointing out how bad livestock is though.

[@EtGtt]

+Unbearable Pain Also Children, theres been no warming in 19 years. So, if you think your GW idiot parent is an idiot- your right. Go live a productive life, and ignore yoru depraved parents.

[@gcxred4kat9]

CO2 is plant food. We were down to around 280ppm 100 or so years ago which is getting dangerously low for plant health. We've risen to 400ppm and the earth is now greening. Plants lose less water when they have to open their stomatas (small holes) on their leaf surface to let in CO2. Thank god for CO2 emmissions.

[@GANTZ100pts]

3:09 So I guess you never heard of the maunder minimum. During the maunder minimum solar activity was very low which cause temperatures to drop.

[@crazyworldlarue8388]

We're in a solar minimum or sorts, now. This is why temps for the USA from Oct to June have been the coldest and wettest in temperature recorded history.

[@Encephalitisify]

Which is not happening. We should be cooling now as we are already close to the minimum.

[@Encephalitisify]

Crazyworld Larue lol. The coldest in recorded history?

[@TheeRocker]

@@Encephalitisify Our records are not totally relevant.. when it's a smidgeon of time, but yes according to 'our' records. We can't control the earth rotation revolution, affects of the sun, the plates we live on... I find it fascinating we are not much different than fish in an aquarium, except who will clean our tank ? Seems like a logical question, but our tank is so large for one, another we actually have no tank... Even if we had a tank, we do not know how to control or filter the mass of air and water our planet has. The media for a filter would be what and how much, and is it recyclable / reusable by any percentage, and where does the waste go... No answers, only logical attempts.

[@francismacmillan3077]

The IPCC is a fraudulent agency. They started their data collection right after the Dalton minimum. A rather small data set when compared to greenland ice core samples. The magnetosphere is waning allowing more cosmic rays which impact ENSO which redirects jetstreams from zonal to medidonal. The amount of misinformation in this video is astounding. Co2 is plant food

[@c.rutherford]

Thank god there are still sane people out there explaining whats really happening to the planet. America is under mad management right now

[@QuikVidGuy]

5-8 degrees Celsius in 20 000 years is probably a lot more severe than I'm imagining

[@masterevar3515]

If the temperatures rises 3,1° celsius from today, most human life wil die out. It is VERY severe :3

[@sangetube]

Master Evar "If the temperatures rises 3,1° celsius from today, most human life wil die out" What makes you say that? It would open up a lot more farmland on the planet.

[@SadoMessiahLP]

Master Evar if it was 15°C yesterday and 25°C today i can 100% asure you that nobody will die because of that!

[@QuikVidGuy]

SadoMessiahLP I see you get your understanding of climate from Fox News

[@QuikVidGuy]

SadoMessiahLP local temperature change is not at all the same as global temperature change.

[@yurisucupira]

Looks like *the greenhouse effect is an adiabatic (pressure-induced) process* and therefore doesn't depend on the composition of the atmosphere. The CO2 concentration in the atmosphere is thus irrelevant to the greenhouse effect, because its concentration in the atmosphere doesn't affect the intensity of such effect. Here's the DOI code of such scientific paper: *10.4172/2573-458X.1000112*

[@yurisucupira]

Even though global warming is something that does happen, it doesn't make sense to talk about a "global mean temperature" and then measure and monitor global warming on the basis of the changes that occur in such "global mean temperature": www.sciencedaily.com/releases/2007/03/070315101129.htm

[@yurisucupira]

Contrary to mainstream propaganda, there's plenty of peer-reviewed scientific papers supporting skeptic arguments against ACC/AGW (Anthropic Climate Change, aka Anthropic Global Warming, i.e. global warming caused by humans due to CO2 emissions): www.populartechnology.net/2009/10/peer-reviewed-papers-supporting.html

[@mpetersen6]

One thing that probably tripped the Earth in the current Ice Age cycle was the separation of Antarctica and South America which allowed the Antarctic Current to come into effect along with the wind systems of the Roaring Forties and Furious Fifties

[@colinp2238]

There always seems, to me, that there is one factor that is missed out - the location of the solar system in the galaxy at any time. As the solar systems spins through the galaxy it may encounter dust clouds or other interstellar things that affect us. The period it takes is so long in human terms that we have no way of detecting this and so we are ignorant of it but it is a logical conclusion. Although space may be empty of stars in the region it does not mean that it is empty of particles.

[@MerkhVision]

That’s a very interesting point! Do you have any tentative theories as to how those things might affect us? Or a list of the types of phenomena we might encounter?

[@colinp2238]

@@MerkhVision It is known that the Solar System travels through interstellar dust regions in the galaxy that must alter the Sun's radiation

[@VictorbrineSC]

@@colinp2238 The Sun makes an entire orbit around the Milky Way's center in 250 million years. It's difficult to verify if there is any long term changes in global climate across millions of years, however Ice Ages on Earth are not cyclical. There are currently 5 known ice ages, we are living in the 5th one. These glaciations did not appear cyclically in Earth's history. Another point to take in account is that although there are warmer or cooler regions of the galaxy, or regions with more dust or less dust, the sheer size of the galaxy and the overhaul temperature of the Universe (which is estimated to be an average of 2 degrees Celsius), as well as the immense distance between stars and even individual particles, would not be enough to have any consequence on the Solar System. Everything inside the Solar System depends on the Sun, not whatever is out there. So no, the location of the Solar System in the galaxy does absolutely nothing to the Earth's climate.

[@muskmadness1]

Oh yes, such a fascinating point to note. I would love if we can discover more on this and possibly tackle the climate hysteria we see around these days

[@musicisbrilliant]

My NEW FAVORITE CHANNEL of all time! And thats saying A LOT. Keep em coming please!

[@christopherd6399]

There is nothing to worry about. Enjoy your warm days, your sunsets and gentle rains. Take in the breezes that come and go and enjoy your life. Find joy in the little things. Love your family. Your friends. We'll all be just fine.

[@Porygonal64]

tl;dr "Save the Earth!" should be "Save the humans!"

[@SPACEMONKEY288]

The 64th Shadow pretty much lol the earth will fix its self once were killed off its just gonna shake us off and fix its self aha something we dont want to happen.

[@VicariousReality7]

The 64th Shadow Save the humans! Then make more of them in an eponential rate!

[@jamesx2268]

The 64th Shadow I see how those things might be in conflict, actually.

[@alexl1178]

"Save the humans" - Says humans who are killing themselves. o-o Go us

[@RickyGExtra_TX]

Kill all humans!

[@whaleshrimp111]

All children and many adults should watch this and try to understand what is actually going on as the earth warms up again!

[@combomatrix]

Hey Hank, please have more graphs and timelines and sorts in your videos, more graphics, surely more fun learning!

[@AgentSmith911]

So to stop the next ice age we need to let out as much CO2 as possible? Cool, I'll do my part 👍🏻

[@jacknisen]

Mee too. Drinking a beer as I type.

[@ObjectsInMotion]

9:57 "An incredible amount of Heat for this research" I see what you did there Hank. I see it.

[@calebengelbrecht7812]

?

[@ThatOneWeirdGal]

I don't get it.

[@Tibovl]

@@ThatOneWeirdGal He got heat on a graph showing temperatures

[@NuclearDetractor]

This is one of the best, most concise and balanced videos on this topic that I've seen. Very nicely done.

[@sharonsloan]

My favourite channel on you tube! I can literally spend hours watching videos from SciShow.

[@MikhaelAhava]

One of my favourites

[@SquirrelASMR]

I like hank

[@adonisnetworks]

I love fiction too

[@moumibiswas]

Same,

[@bigbirdmusic8199]

you love being indoctrinated, huh?

[@பூங்குழலி-ய7ட]

listening to young hank green explaining my current topic of interest is making me so happy

[@modolief]

10:53 "But what the cost will be for humans, we're going to need some more data on that." Time for an update yet?

[@modolief]

+Dennis Vance Particularly: methane. I would like to know all about methane releases in the arctic tundra and ocean clathrates.

[@lfiostrano762]

+Devoti okay thanks

[@Atroposian]

Read "Shipbreaker" or "The Drowned Cities" by Paolo Bacigalupi if you want to know the answer.

[@MrxstGrssmnstMttckstPhlNelThot]

So, we kinda saved ourselves from a glaciation period... and then went further and made it worse for ourselves than it would have been. Great!

[@TIMEtoRIDE900]

it's been 0.8*C of warming in the last 100 years - - how hot do you think it is ??

[@jackiebiskan4748]

@@TIMEtoRIDE900 its cool we just need to move all florida men in land and then all off cali we let the water rise and the land get smaller just saying russia will love it they are going to get a lot out of a warm place

[@fudgedogbannana]

Exactly

[@fudgedogbannana]

@@jackiebiskan4748 Yes, but shortly after that we enter into the next ice age, then Russia is screwed.

[@Ron_EZ]

And so, You think that Man can correct these fluctuations… somehow? Then after spending all of these loads of cash that “might” or “might not fix it” the problem. The problem I see is, who can prove that it is actually fixable or needs fixing at all?

[@ValeriePallaoro]

That's ok; not your problem, too late for you. Wonder how the grandchildren of today will feel about it, though.

[@seedplanter7173]

Ron Easley They can manipulate the data anytime they need to...They were already caught doing it up in Boulder Colorado. "The Scientific community" are their dirty whores doing what they want, whenever they want, anytime they say.

[@christopherbrummet4997]

@@seedplanter7173 Then go out and 'prove' another theory. The reason 'science can say whatever it wants' is because their statements are based on evidence, not a bunch of KZbin Comment idiots. You can easily, with cheap and minimal equipment/resources, do this research yourself....but you won't, because ignorance is self sustaining.

[@raymondeissler656]

Christopher Brummet which Scientists are you referring to the ones for or against Global Warming?

[@christopherbrummet4997]

Yes. Both. Some scientists are just better at it than others. The ones I trust are the ones who have built the consensus that humanity's industrialization has rapidly increased global climate change. But if the dwindling 3 percent of scientists confident that carbon and other greenhouse gas emissions don't impact the world wanna step up and prove it, they're welcome to do so.

[@luvkirby4ever]

Hank!!! I'm a longtime Nerdfighter who is finally able to financially go back to school (I'm halfway to my B.S. in Environment Health and Safety). I'm doing my studies through an online program and they sourced this video as one of the learning materials for this week. Thank you for everything you've done for the learning community... I missed being a student so much and am so excited to see this here. DFTBA!!!

[@jerryp5039]

The hockey stick forcast has wildly over estimated warming and the revised graph in this video shows the same exaggeration. The data of sun activity correlates almost perfectly with the actual temperature changes. CO2 is a minor green house gas in comparison to water vapor. Historically CO2 increases after the temperature increases due the release of CO2 from oceans as they warm. Since CO2 is a greenhouse gas and it has been increasing it was assumed that the temperature would follow. This has been way off the mark according to all the various climate change models. Since the models based on CO2 have been so dramatically wrong maybe it's time for the IPCC to reevaluate the assumptions and stop defending psuedo-science and allow healthy skepticism.

[@philheaton1619]

Most figures I have seen say the K-T asteroid was 10 to 15 kilometers wide, not 200.

[@AdSd100]

He said it wrong, the crater is 200km wide not the asteroid itself.

[@philheaton1619]

Crater equals 200km wide makes sense.

[@cgaccount3669]

Phil Heaton He was referring to a different study. Studies have shown that some studies are just plain wrong. Sometimes every single thing scientists of the day believed is completely wrong. But we're always certain that we're smart enough at this moment to know something with absolute certainty. Somewhere someone is saying the asteroid was 200km wide cuz I heard it somewhere. And he tells 2 friends... that tell 2 friends

[@finanov6646]

Tbh a 200 km asteroid would have probably destroyed all life on Earth and probably make Earth look like either Venus or Mars today.

[@antoniocarroll5127]

Or his script could have been wrong and he just went with it, assuming his audience would understand.

[@steveb0503]

I'm actually kind of afraid to look through this "comments" section.

[@zeleotproton952]

I feel yha.

[@tnekkc]

Zeleot Proton Murder suspect on the first 48 [not fiction, but confessions video taped as they happen]: "Do you feel me?"

[@lilaclizard4504]

I'm thinking the same as I start looking now

[@richardhoepfner1633]

As I am just as sure you are afraid to peek out through the door of your parents basement.

[@beckmeehan7123]

Agreed.

[@kerryparks8509]

I'm a biochemist, one of the 99.99% of scientists who are not climatologists. So I would like a genuine climatologist to give me one genuine piece of irefutable evidence that proves beyond a reasonable doubt that there is a direct causation (not a mere correlation) between atmospheric CO2 and global warming. Hint: according to Greenpeace founder and ecologist, prof' Patrick Moore temperature and CO2 have never been in sync over the past 500 million years. In fact there have been many instances that temp goes up when CO2 falls and vice versa. He also says evidence shows we would be far better off if CO2 was 600-800ppm But who want to look at earth history beyond the past decade, eh?

[@Tibovl]

First of all, Moore is not a Greenpeace founder. Secondly CO2 concentration and global temperature matches very well once you factor in the sun. Thirdly, a rise of CO2 has catastrophic consequences for all animal and plant life. As well as increased extreme weather such as heat waves and droughts with dire consequences.

[@presidentmegtawma6845]

The CO2 levels in the atmosphere were over 7,000 parts per million during the Cambrian Explosion. How is our current 410 parts per million a problem? Also, the temperature of the earth doesn't go up because there is more CO2 in the atmosphere. The temperature of the atmosphere goes up (due to a combo of these many solar cycles), the ocean warms up, and more CO2 is released by the ocean. The temperature of the atmosphere goes down (cycles again), the temperature of the ocean goes down, and more CO2 is absorbed from the atmosphere by the ocean. The limited infrared spectral absorption of CO2 makes it an inconsequential "greenhouse gas." By far, the most prevalent "greenhouse gas" is *_water_* *_vapor_* . There is enormous amounts of it in the atmosphere and it will absorb most of the infrared spectrum. Also, man has zero effect on the amount of this gas present in the atmosphere. Everything you said after mentioning Michael Mann's name is BS. The average temp today is lower than it was in the 1930's. It is NOT rising at a record rate. Cooling after the 1950's was so dramatic, scientists believed we were going into another mini ice age. They believed this until the 1980's; enter Michael Mann. He received a lot of criticism because his methods and conclusions were crap. Every prediction Michael Mann ever made about climate change, has been absolutely wrong. Real climate science: kzbin.infovideos

[@sodalitia]

Hail Heller!

[@mechellekingman7833]

The sun controls the earth's warm hot or cold period s,the sun is now cooling ,so the earth will cool ,last week record ice gain in the artic, glaciers growing in mt st Helen's and Chile

[@Makem12]

This was an extremely fair analysis of the climate. Usually when I watch scishow talk about climate change I don't get such a balanced look at the climate. I'm very impressed with this video. I like to come here for scientific fact with only necessary interpretations added. This video did just that. Thank you

[@davidklug5886]

should do a video on the pending switch of the earth's magnetic poles.

[@ewbrowning]

Done. kzbin.info/www/bejne/l4fUf2SqjJaebdk

[@ValeriePallaoro]

@@ewbrowning Nicely found.

[@agamahuja7630]

you're videos are awesome!!

[@cq61313]

This was Fantastic... We Don't have to save the Earth... We have to save us from Ourselves... I wish we would use the term "Environmental Disruption"

[@Harry_Howler]

7:00 I'm more than 5 years too late, but the asteroid that caused the K-Pg mass extinction 65 million years ago was 10-15 km wide, not 200 km. However, the crater it left is estimated to be 150-200 km.

[@DavidvanDeijk]

in climate science "before present" is defined as before 1950, not before the actual present. This causes a lot of confusion.

[@mikedawson2105]

Thank you SciShow for an excellent review of the Earth's climate during it's history. And thank you for not entering the political debate about today's climate anomalies.

[@niko-laus]

why not explain why the co² level always follow the temperature with an delay of over 100 years

[@dodgedabullet670]

Please explain further!

[@VeronicaGorositoMusic]

to some extent, 600 years, but yes, nobody consideres that possibiity except few ones that aren't so biased about this issue.

[@VeronicaGorositoMusic]

@@dodgedabullet670 skepticalscience.com/co2-lags-temperature.htm

[@blank.9301]

Gitana Maldita the industrial revolution was in the early to mid 1800's so about 150-200 years ago. We weren't using COaL before then. How did the trees and plants survive before our input of CO2 emissions?!? 🌋🔥😤😷

[@bigbirdmusic8199]

@@blank.9301 right? its almost as if climate alarmism is nothing but fear mongering...

[@alecrisser12]

these comments are dissapointing

[@jaycavalli6061]

Dope video. Science should not be politicized I just want to know what's going on

[@yusefendure]

Too late. You live in a country based on slavery, exploitation, fossil fuels, and the expansion of empire. Everything is political especially when scientists get their funding from the government.

[@mahande88]

Wrong video then, there is a lot of politics in this one.

[@accessstlouis]

@@yusefendure Don't you wish you could move here?

[@meyerlemon3776]

@@accessstlouis I know right. People these days

[@charlieknight8563]

Showing LOVE to the SciShow channel.

[@Flameboar]

You left out the green house compound which is the largest (by mass) and by IR absorption. This is H2O.

[@scottekoontz]

Feedback.

[@Flameboar]

What do you mean by feedback?

[@scottekoontz]

@@Flameboar How do you get more water vapor? Warm the air. How do you warm the air? CO2. We can pump more CO2 into the atmosphere, and obviously that is what is happening, and by itself it will warm the planet. But it is the warming that causes the air to hold more water, which is a greenhouse gas. Feedback. It's one reason why the temp increase is not assumed to be 2-3x more than CO2 alone. "How much does water vapor amplify CO2 warming? Studies show that water vapor feedback roughly doubles the amount of warming caused by CO2. So if there is a 1°C change caused by CO2, the water vapor will cause the temperature to go up another 1°C. When other feedback loops are included, the total warming from a potential 1°C change caused by CO2 is, in reality, as much as 3°C." skepticalscience.com/water-vapor-greenhouse-gas.htm

[@vmgqie]

@@scottekoontz more water vapor more clouds and clouds reflect sun's rays a cooling effect a negative feedback.

[@scottekoontz]

@@vmgqie So CO2 is really REALLY warming the planet if the feedbacks are cooling it. Wow. Lots of warming.

[@homersimpsonIV]

My brain needs a CPU upgrade to keep up with the manic pace of this data dump, I mean presentation.

[@PersimmonHurmo]

You need to get a brain first.

[@ColeWatchTower]

CPU update complete! You now have the ability to slow this presentation down to the desired speed and replay on demand using your phalanges interface.

[@YTEdy]

At 6:56 or there abouts. "Then another climate driver intervened" That asteroid was about 20 km, not 200 km. Small nitpick, but you might want to make a note of that.

[@ValeriePallaoro]

Yes, small nitpick ... happy now? *facepalm* and ffs

[@WildlifeUKNatureByGlenO]

I think that the sun dictates over the course of time, the earths climate. Everything else is secondary

[@Dana-or1he]

After nearly six years it's probably time for an update

[@peteniikkonen3706]

Yes. 1000000000 is now 1000000006

[@Scubadog_]

We really need to get a new planet to fuck up... ...Like Mars.

[@drd444]

Mars sounds good and when we are done with mars... WE MUST LEAVE THE SOLAR SYSTEM!!!

[@jalenrose2332]

Uranus.. if you know what I mean

[@ajaxtaur]

Jalen Rose I would love to wreck Uranus.

[@ajaxtaur]

jayrod jones No.

[@MrPhilsterable]

scubadog2000 In the immortal words of George Carlin: the planet is fine, it's the people that are fucked!

[@whit38]

the earth will be just fine, we’re not killing it. we’re just killing ourselves

[@ldean2731]

you age like fine wine.... love your stuff ...and your shorts are effin hilarious

[@steelcross1004]

and I am 6 years later. Update? what ARE the consequences to humankind?

[@tinapatton7346]

Science gave us BIG Carbon $hills - Science can save us from BIG Carbon $hills.

[@eriklaurenmayle]

Life is carbon based and has always fared better when carbon is more plentiful.

[@tinapatton7346]

BRITElite reply to e$oterik. All life-forms are proportionately multi-element-based including carbon. Which if too plentiful can kill life-forms including disproportionate e$oterik who can pipe it's own car fumes straight into it's own home and do all other life-forms a BIG favor.

[@gabb159]

@@tinapatton7346 "BRITElite reply to e$oterik. All life-forms are proportionately multi-element-based including carbon. Which if too plentiful can kill life-forms including disproportionate e$oterik who can pipe it's own car fumes straight into it's own home and do all other life-forms a BIG favor." It would be the carbon MONOXIDE that would kill him in that scenario, not carbon DIOXIDE... People that live in submarines live in a 3000+ ppm carbon dioxide environment just fine. The largest boom of life on earth was when C02 was over 5000 ppm. Please learn something before spouting stupid.

[@tinapatton7346]

​@@gabb159 BRITElite reply to weak-end dim Gabb1: Too much of ANYTHING can KILL!

[@Aeturnalis]

Are you going to marry that boot, or just keep licking it?

[@its.cassie]

No mention of pole shifting, which destabilizes our magnetosphere, affecting our climate ?

[@geraldfrost4710]

oh, those pesky "north seaking" bacteria the poles flipped, and they didn't go "north" which was up, but down. whole phylum died. Yeah, that just happened. and it will happen again....

[@a.kitcat.b]

Very easy to digest videos to give me info! Amazing!

[@azbrowne]

Give this guy his own kid's TV show. He could be the next. Bill Nye.

[@vidblogger12]

+Alex-Zander Browne "Hank Green the...er...Science Bean? Yeah, let's go with that."

[@ericclaeyborn8359]

Is that supposed to be a good thing?

[@Ivan.A.Churlyuski]

I disagree, this guy doesn’t seem like a douche bag.

[@jonathanoconnor9546]

Bill Nye is not a Scientist. Only degree is Mechanical Engineering. Saw him say that Evolution is like a Dachshund slowly turining into Great Dane. Just one problem: All.domestic dogs have the mitochondrial DNA of a Grey Woff. A Great Dane and a Dachshund are the same animal.

[@mikepalmer4371]

When the earth is ready it will shake us off like a bad case of fleas....... :George Carlin

[@Len124]

This video is pretty old, so I'm sure this has been said to death and I just missed it when I scanned the comments--but the asteroid was 10-15 km across, not 200 km. It's not nitpicking, it's an order of magnitude difference in size. Basically Manhattan versus the state of New York. Life would still be struggling to pick itself up and dust itself off, if not completely sterilized.

[@joereidbogfrog]

Great presentation.

[@kdc43]

I can't BELIEVE he said that asteroid of 65 million years ago was 200 kilometers big (124 miles) , the science shows says it was only 10 kilometers big (6 miles). Ol' Hank was off by a factor of EIGHT THOUSAND ( 8,000 ) when it comes to the total mass difference!!!!!

[@thebestjannanowhere7155]

send him a message he probably made a booboo on the script, happens

[@bunchofdumbsitsyouallare3620]

QLR Anastasia the crater is roughly 180 km(please fact check me if you care because im saying that off memory) i think he mixed up the size of the crater with the size of the asteroid

[@DavidFMayerPhD]

Not 70% dimmer, 30% dimmer meaning 70% of current solar output. Please correct that blunder.

[@Remmeister2000]

Shut it, I believe him not you. Go away

[@evanshawes6238]

@@Remmeister2000 you must be RACIST!

[@markhash2230]

What came first, the green house gas "chicken" or the solar event "egg". This is not being discussed because it doesn't support the fear narrative.

[@user-yv6vx]

This video needs an update. The last ten years have really solidified all of this and more.

[@-.._.-_...-_.._-..__..._.-.-.-]

This problem isn't that Earth is being destroyed. The Earth will be fine. The problem is that humans may be destroyed.

[@justinmiller7398]

Destroyed is a long shot. Technology brings up so many short comings. However drastic changes in haves and have not's do to instability in climate will be a thing for sure.

[@mariannefischer3613]

Warmth will not destroy humans. Humans have flourished in the warm periods. Only the return of ice is dangerous. Humans were near extinction when the ice age finally broke 12-13,000 years ago. Saving humans by the skin of our teeth. We should be hoping for another two degrees F of warming.

[@-.._.-_...-_.._-..__..._.-.-.-]

Marianne Fischer Where does our food come from?

[@user-bk1js1xq3o]

Animals and plants idiot

[@user-bk1js1xq3o]

There were still living organisms. They were growing and got used to the temperatures in the ice age. and after that, they died. but coming from the dead ones, plants started to grow. And animals roamed. AND we survived by eating many animals and plants. And don`t act like a vegan and say that we never ate meat. Since humans were alive, we ate meat.

[@HaNsWiDjAjA]

Can the azolla solution be used in our current situation? ;)

[@celinak5062]

Like duckweed or throwing iron in the oceans Or make sugar and burie it

[@gordianplot9347]

its an excellent livestock feed, easy to grow, some people eat it. it fixes atmospheric nitrogen. one of the fastest growing plants in the world. it could defiantly be part of a solution. maybe if someone engineered it so it was a more complete nutrition source, and maybe to grow on seawater. it could work even better.

[@uchiamonkeyguy]

Didn't the Sahara used to be a rainforest? I heard that somewhere.

[@cheryldeboissiere7824]

Need more graphics... if possible...

[@patrykdrozd2637]

i love C02 and so do my veggies

[@richardhill8117]

Climate Change and CO2 is bollocks

[@ADyingFaith]

I really enjoyed this.

[@bartonpaullevenson3427]

This is a good overview, but some of the details are careless mistakes. Check your details.

[@phanupongasvakiat337]

Short is good but it is not really, because it is packed with so much information fired at us rapidly, I had to listen to five times. Thank you for all the information.

[@phanupongasvakiat337]

Just trying to read some of the comments take hours.

[@genli5603]

Wake me up when there are forests in Iceland again.

[@kushdeala6623]

You can wake up there are forests in Iceland. Greenland is the cold one forgivable mistake but google man

[@randyferguson3928]

Just sign over your future to the technocrats and all will be well.

[@mudball47]

It was hotter in the 1930's, before rise in co2 than it is now. CO2 is good, plants grow better.

[@altareggo]

Globally, it wasn;t hotter in the 30s... in some parts of the world only. CO2, to a certain extent, DOES make plants grow faster and bigger, but sadly for us, it DOESN'T mean that they contain more nutrition: plants which grow too large too quickly, are considerably less nutritious per calorie than those which grow more slowly. This fact ( Take a peek at this abstract, especially the last few lines: more CO2 is NOT a good thing when it comes to human nutrition!!)

[@grantkastel2757]

no it wasn't and actually the increased greenhouse gases like co2 are making rain and other environmental factors more acidic and scientist believe this could be very bad for a lot of plants.

[@Cuzilla47]

@Vlad Dracoson Finally, a much needed knowledgeable, intelligent response in this comment section. I dare say most of the "Global Warming" alarmists have never heard about the lower limit CO2 extinction problem. Keep commenting, the alarmists need reeducating!

[@departed402]

"I have survived your predecessors, and I will survive you." - Merovingian in The Matrix

[@alanblanes2876]

Bravo, Hank Green .... for being able to encapsulate the history of Earth's climate so clearly and accurately in 11 minutes and 19 seconds; that is an amazing record!

[@ericdebord]

If it was getting colder , these same people would be blaming humans and pollution for the cold....

[@barrywilliams6732]

Tony Heller show this to be the case already. Find his vids on KZbin. He's been debunking this junk "science since 2008.

[@VeronicaGorositoMusic]

No, blaming sauvage capitalism, so we must implemente communism instead ;) Nice try redders.

[@davidjacobs7447]

Do you need to include the twelve thousand year catastrophe cycle that the Earth experiences from its magnetic shifts and excursions. That data needs to be put into the model.

[@Aeturnalis]

The reversal of the magnetic poles isn't exactly cyclic; the changes happen anywhere between 200,000 years and 1.2 million years, and tend to last for 10 to 30 thousand years before returning to normal. They also don't have any significant impact on climate, though when the next one happens, it'll throw our communications and energy into chaos, assuming we haven't gone extinct by rendering the planet uninhabitable for humans by then.

[@carriew8566]

I've heard out poles have shifted. How does this impact our planet as different areas are warmed and cooled? How does the melting of permafrost and the release of methane impact Earth systems? I've also heard this methane release is sizable and could impact the atmosphere, so how do we measure this and it's impact on warming the Earth? I've also heard that the warming trend started well before the industrial revolution. How do we measure human impact against these other factors? There are so many parts, and Earth has always changed, so how do we KNOW how much our activity impacts the Earth and what changes will actually make a difference?

[@JerrMakak]

There are weird changes of Earth magnetic field - poles are moving many kilometers per year. I find it maybe more weird, it is not discussed in relation to climate.

[@BBaker916]

Any climate video or report that leaves out the Medieval warm period should not be taken seriously.

[@florianrudowable]

I feel sorry for the climate change deniers who clicked on this video to confirm their opinion but then got real facts.

[@FitzgeraldStanburyWeissV]

I knew this comment section would be volatile. But it was amusing reading through much of the drivel.

[@Lukemage]

7:05 200 kilometer asteroid? Wasn't the Chicxulub impacter only about 10-12km wide? The crater it created was 200km wide though.

[@mcardifortress]

Yeah according to wikipedia it was around 10 km. A 200 km asteroid is like a smal dwarf planet !

[@bobroberts7305]

I'm amazed that Hank uses the Mann "hockey schtick" - it's been thoroughly debunked. Even the IPCC quietly retired it.

[@dannylandrum7899]

Great video, guys - very apropros.

[@KaosKrusher]

that's how you spell it in english? real french spelling is: à propos

[@patbrennan6572]

i don't think that meteor was 200 km wide..10 k tops.

[@pmishra786]

It fell between south america and Africa. Today if u hypothetically connect both, they exactly fit in, the coastline of West Africa and Brazil is a proof. That was where the space rock landed.

[@steveschmengle5622]

Mr.man study was flawed as I said below since 1863 the temperature has risen only .8 degrees Celsius

[@user_mac0153]

That can't be correct, everyday the overnight temp drops below double figures. By 1 hour after sunrise its reversed, sometimes rising by +15C. The temperature rises far more in Summer and Autumn. You gotta get out of that Cool Room.

[@bigbirdmusic8199]

@@user_mac0153 are you an idiot? What part of AVERAGE dont you understand

[@ValeriePallaoro]

@@bigbirdmusic8199 what part of reading don't you get? No where in his words is average even put. STFU and stop calling people idiot if you can't read *ohglorybethestoopidsinthisworld*

[@josephtobias9053]

Have read for hours, great minds discussing 5 ice ages, with six theories about why, and the consensus is No one is certain. Its a good video but wrapping things up so neatly when there's no consensus gives the impression these are all facts. Pangaea has broken and reformed multiple times www.ucmp.berkeley.edu. geology.utah.gov/map-pub/survey-notes/glad-you-asked/ice-ages-what-are-they-and-what-causes-them/ take every video with a grain of salt!

[@dogpatch5220]

He is the first to attempt to describe the complexity of our climate!

[@PeterWest70]

How abouts :mini nova" cycles of about 12800 years, which can trigger ELE on the planet? Is it any wonder that there are no ancient human history beyond that threshold? Great topic!

[@TMB247]

Damn those Ancient SUV's ... they really needed a Mastodon Algore back then /s

[@TREMILBERG]

This presentation makes my ears sweat.

[@jacob_swaggerz]

"So you know the hockey stick graph..." Lol... this didn't age well...