5 Human Impacts on the Environment: Crash Course Ecology #10

[@thetandlcorner5010]

_"Tina here. If you have no idea which one's are the 5. here!"_ Deforestation 5:37 -6:55 Desertification 6:56 -7:41 Global warming 7:42 - 8:44 Nonnative species 8:54 - 9:20 Overharvesting 9:21 - 9:42 _"If I am incorrect, tell me! Like if you want everyone else to see this!"_ EDIT: _"Guys I know it's in the description but not everyone checks that, so here it is in the comments."_

[@edgarn8084]

FriskPony you’re the goat🐐

[@stellac8160]

omg thanks so much

[@davidsarpong8042]

your a life saver thanks so much :)

[@jadeemerge3770]

tysm now i can do all my work lmao

[@isabella-em3rt]

life saverrr

[@NataliaSchenone]

wow this video has been up for 10 years , and we're living out everything he's explaining. At greater rates.

[@Alyssa-wz8mx]

Anyone else here 7 years later for online classes?

[@llp7722]

Any1 else hate bts

[@Alyssa-wz8mx]

😂

[@stellac8160]

yes lol

[@derpyderp1144]

Ye

[@3amigos949]

BTS Lover29 hahaha yes

[@bencorey8315]

Hey! Biology teacher here: I always enjoy your videos, Hank, but this series on Ecology has been my favorite! Your masters in Environmental Science shows through your passion.

[@babbletron8730]

hey ben its me, jack. I think you are stupid and should stop teaching.

[@kai-zi9st]

mann this is awesome. I admire how passionate he is.

[@Damouse007]

The key is "few hundred thousand years." As he says in the video, the things we have been doing and the things that are happening are taking place at an astoundingly fast pace.

[@Assasiinzz]

Its my Bio 4 exam on Friday and this show is so helpful for revision, im lucky to have it at the same time as my exams, thank you John and Hank

[@alicethornburgh7552]

I went to Humboldt State University to study Environmental Science, and this is incredibly dumb... At 0:25 he says that human activity "could be" responsible for the extinction of "nearly" 1,000 plant and animal species in the last 100 years. The real numbers are way higher than that. "Scientists estimate that 150-200 species of plant, insect, bird and mammal become extinct every 24 hours. This is nearly 1,000 times the “natural” or “background” rate." Don't get me wrong, crashcourse makes some really cool stuff, I've seen it... But this guy made a 10 minute presentation on environmental science, and within 30 seconds he shows that he fundamentally misunderstands the magnitude of the crisis he's talking about. We're not just cutting down a few trees and changing the temperature a bit. We cut and burn 40 football fields of trees per minute. We redirect so much water and till so much soil that we have created deserts the size of countries. Misinformation like this makes me furious because it makes people think, "well if only 10 species a year have become extinct over the last 100 years, then maybe this is something we can solve next year if we just try a little bit harder. I'm sure that environmental group or whatever has it on lock..." People need to understand that by doing as much damage as we have, we have committed ourselves to fix it, and it's going to be expensive and controversial and it's going to take decades, and if we don't, this extinction event that we've created will continue to spiral out of control, decimating all the most beautiful things we know and love or want to discover. Want to know what happens when you cut down a very old tree? Here's a tree centuries old, and looks nothing like the other trees around it, and covered in a strange moss, and sweet smelling purple flowers. Only one species of bird in the forest is adapted to suck nectar from these flowers, touting a ridiculously long and otherwise impractical needle of a beak everywhere they go. When this tree falls, its flowers become extinct because they can only grow on that particular tree. The birds return to find the tree and its flowers dead, and they too become extinct... and the bugs that can only survive on the feces of the birds, and the fungus which only grows on the corpses of the poop eating bugs, and the bugs which only eat that particular fungus, and the spider which primarily eats the fungus eating bugs, and so on. The effects ripple through the forest, and hundreds or thousands of other species become extinct because of the felling of this one tree. You guys need to understand... We can't keep doing what we're doing and expect everything to be okay. Everything we love came from the rainforest- Chicken, bananas, strawberries, corn, wheat, prozac, marijuana, cocaine, opium, coffee, the list goes on- basically everything good comes from there, and what most people don't know is that's just the tip of the iceberg. We have yet to discover so much amazing food and medicine that exists in the rain forest, it would be a shame to lose it. Of course the rest of the world is also in jeopardy, but it isn't nearly as valuable, and I think this is the end of my soapbox. Look elsewhere for your education.

[@theguywholovespie2118]

YOU TELL 'EM

[@tarnyred1793]

Maybe he meant "thousands".

[@karimtabrizi376]

I think if people at least know the situation we all face that's a start. But if we idiots like Trump etc and OZ PM who deny this is an issue we are on a downward spiral.

[@apearl420]

Alec Thornburgh totally agree with you. We need to change our lifestyles and paradigms. Science and EIA should come before policy making but unfortunately it doesn't. Ex: the massive tar sands in Canada one of the worst planned irreversible environmental damage in the world under the Harper government.

[@noahreed9091]

Dang, this was more informative then the video itself.

[@mjlock7338]

can we get a whole separate segment for environmental science?

[@sunitamahadik7746]

Find out more about

[@awesomeloren8174]

YESSS

[@Nikola357gg]

hello MJ Lock I saw your comment and see that you care about the environment and the climate therefore I wonder if you are open to see what we do and help us together do something concrete to improve the environment?

[@huhyunjoy]

thank you for helping me this year in biology! human impact is my last test this year, wooo!! i’ll be back for my final next week

[@viptechies1843]

Imagine watching this again and realize that the Amazonian Forest is almost gone due to extreme wildfire. And imagine how many biodiversities were eradicated due to that phenomenon.

[@chococookies4]

The plants will grow back due to secondary succession. The plants always get replaced, but the animals are who I am grieving for.

[@protectamericasconsumers4219]

All of these things are important for people to know whether you are a student or teacher. We have to be aware of what we are doing to the environment, for the long haul.

[@Shimamon27]

And how do you propose to make people care about anything other than their massive endless privileges? They want MORE not LESS. They will never give up their Hedonism, until there is nothing left to eat, and then they'll all enter into massive mental instability, and start killing each other by the masses. It'll be total carnage, and nobody will learn anything from the whole event. End of story, everybody loses.

[@sonokoluvr]

Mindeer it’s the sad reality

[@ashleygonzalez6119]

Wow, this is such a great video. I learned that humans have caused so many problems to happen such as littering, cutting trees and etc. If we had to do what the environment does for us as of today it would take us longer and a lot more time. The ecosystems are a combination of old and new things that create the environment we are in as of today.

[@mikem274]

Lmao definitely another depressing yet entertaining and insightful episode of Crash Course. Thank you Hank!

[@Tornair]

I love these Ecology episodes! It reassures me that this is what I want to do with my life.

[@josephmorgan1595]

Who else has to watch this for there biology class?

[@rex7248]

what are you talking about everyone here is from trigonometry

[@josephmorgan1595]

Oh.

[@Moni.moni98]

+Eevee in a hat (Nature Mage) Me lol xd

[@XinYiZhang-m5z]

me~

[@josephmorgan1595]

:3

[@biamenezes7801]

This is an amazing video and I'll surely watch this again. The part when you show the deforestation in the Amazon rainforest was kinda sad to me, since the majority part is contained within my country.

[@LearnEnglishESL]

Good presentation... "We cannot segregate the human heart from the environment outside us and say that once one of these is reformed everything will be improved. Man is organic with the world. His inner life moulds the environment and is itself also deeply affected by it. The one acts upon the other and every abiding change in the life of man is the result of these mutual reactions." -Shoghi Effendi, Baha'i Faith

[@amoolaassad4701]

Tom. Iam having biology exam and u really helped me in taking few IMP points that may help mee.. Really thank u ❤️👏

[@savannahmeachum7027]

I enjoy crash course videos more than other videos when learning or reviewing for things that they also happen to cover

[@DaehPhone]

In the midst of these walls of text, I would like to say I love this man's voice.

[@Nt3Hr]

Hi its 7 years later its 2020 now

[@amylowis4595]

People who don't study Biology or Ecology should be required to watch this video

[@amylowis4595]

+COOL GUY111 in defence of myself, this photo is 3 years old

[@theguywholovespie2118]

+Amy Lowis They should be required to watch it every day for a month.

[@theguywholovespie2118]

How about... no. :P

[@amylowis4595]

Hey woah calm down everyone

[@theguywholovespie2118]

Amy Lowis RUN WHILE YOU CAN!!!!! XDD

[@jessieclass741]

I wish everyone would watch this video. People don't realize how dependent we are on the environment. A lot of people think humans and nature are separate but that isn't true at all.

[@الشيخمحمدجمعهتفسير]

that is right. im sure alot of people know it is just that they dont have a reason to care...

[@jessieclass741]

True

[@ishouldbestudying251]

+Jessie Class Did you write this comment just because your teacher told you to?

[@jessieclass741]

Not at all. I wrote this comment because it's my honest opinion. I didn't even watch this for school, or because anybody told me too. I watched it because I honestly care about the enviorment.

[@ibizanhound7891]

Vegan Gains Actual Father What are you even talking about

[@GowanRavin]

Hank & co - please please please do a video on what we as individuals can do to reduce the negative human impacts on climate change, be it by wasting less, changing habits, getting out and campaigning or whatever. I try to do as much as I can but I often feel I don't know enough about the related issues to act effectively, and I'm sure your knowledge base could provide some very helpful pointers to us all ^_^

[@PontusWelin]

This isn't depressing! Not for me at least. It gives me a better understanding of these problems. And I NEED a better understanding. Please, please, please! Make more in depth videos about this subject!

[@EInc1000]

I'm addicted to these videos!

[@zhongliangcai602]

Ezra Grant , I only watch these because my mom tells me to XD.

[@DrMurdockKawfi]

I feel like I need to mention that there are already logging restrictions in the rainforest. Nearly all the trees we use for lumber are grown on tree farms. The people cutting down trees in the rainforest are low income native populations who are trying to make farms and grow food for their families. If we help those people with better farming technology, less land will have to be cleared.

[@nikispivey3316]

my 14 year old kid just started high school about a month ago and she has a environmental science class and she loves it

[@LookForwardtoLifeHeisTheLife]

Thank you for this 'basic' education on the problems that we (humanity) have caused. WE ALL NEED this info to understand the problems and, their poss solutions. PLEASE keep up the good work ! Keep spreading the news and, assisting mother Earth in such ways. TY !

[@777anouchka]

Would you be able to make a video on the possible mitigations or human interventions that can help the ecosystem, the benefits this could do or the harm it could possibly do?

[@centmilli]

watching all these from New Zealand. The presenter is awesome.

[@crazyfett649]

I had to watch this for homework. I get what he is saying, but I almost fell asleep and I was counting down the seconds until it was over.

[@mariagordon-lewis2802]

Thank you for your videos...You got me through biology... Grade: A...Now I need you to get me through environmental science...core concepts of John Muir, Rachael Carson and Charles Darwin...If you can recommend certain videos to me --I would greatly appreciate...

[@kitkat6945]

This man is carrying me for my environmental sciences course for cramming with study notes 📝

[@NoelMarshall]

Great Presentation, Thank You, please keep educating for all our sakes.

[@kandylover139]

I guess that's true. But maybe Hank could have linked to a site about ways to help the environment or something? I guess I'm just so used to Hank and John talking about ways in which we can help the environment, that it's just weird to have a video without that.

[@mikaelboman5553]

Thanks for bringing youtube the best/most needed information out there! Cheers!

[@highspacefox]

these last three are the best in the series! thanks for all the work yall do @ crashcourse, love yall!

[@matthewdangelo8908]

i loved your video...i think the world needs more people like you...thanks a lot

[@Alitari]

Farmers and ranchers are perhaps one of our best and strongest advocates for environmental protection (in Canada, Alberta is considered 'dirty' for its oil sands, and yet it has some of the strongest environmental laws around other industries because of their heavy farming). The trouble with ranching is, as Hank mentioned, overgrazing. Regular farms keep plants in the ground, while overgrazing can result in no plants in the ground AND heavy hoof traffic, a dangerous combination if not managed.

[@pamelareinoso962]

My University should be cutting you a check bc my professor literally quizzes us on your videos

[@nisbahmumtaz909]

Posting a video? Dude, he has a freaking master's in this stuff.

[@HelenaMaksyom]

Thank you so much for this video!

[@tonysintheattic]

True enough. This was actually a pretty enlightening chat.

[@masieldlc12]

"why is this stuff turning the earth into sausage" XD. XD. XD

[@gaming_with_coral1705]

Masiel Delacruz that’s so funny XD XD 🤪😂🤣

[@miraculoustalesofobliviousness]

right?!?! like, i thought i was the only one who laughed out loud for that!!! XD

[@lucas5530]

It's scishow dude! Thanks science teacher!

[@a.t.akayoungdrew667]

"Thank you for watching another kind of depressing video of crash course ecology." 😂

[@ArmandoJustinChavez]

From the journal Earth System Dynamics billed as “An Interactive Open Access Journal of the European Geosciences Union” comes this paper which suggests that the posited AGW forcing effects simply isn’t statistically significant in the observations, but other natural forcings are.

[@then0un]

Hank, you mention cattle as the primary cause of deforestation (in the Amazon and globally) and desertification. I've been wondering if you're vegetarian. As a biologist, you know the industrial meat system is the single largest contributor to greenhouse gas emissions, deforestation, desertification, ocean acidification, use of petrochemical fertilizers/pesticides (for animal feed), use of arable land & fresh water, and the bulk of environmental problems we're wreaking upon this earth. As one who has studied psychology, why do you think people are so opposed to switching to a more sustainable plant-based diet? There seems to be a lot of resistance.

[@makaylamarshall9743]

Zortron culture, and it’s a really big overhaul to change one’s diet. I’m three years in still trying to change my diet and be primarily vegetarian

[@makaylamarshall9743]

And around the 4:30 mark, not only is biodiversity important, but functioning ecosystem cycles are also important. Gotta have all them carbon, nitrogen, and water cycles working together on top of high biodiversity for a fully intact ecosystem!

[@gaming_with_coral1705]

I love this thank you for your time and effort

[@gaming_with_coral1705]

I think I spelled that worng

[@tonysintheattic]

Why are people alarmed when they are made to face that we have an affect and it's not always good. This is actually a thing. The content is the content, watch it, or don't. Whether you like it or not, the truth is the truth.

[@jessd6359]

Thx, really helped me with my homework!

[@KelleyBelly459]

Great video Hank! To to the people calling him an "alarmist": it's called facts. People get all worked up over the economy, over healthcare... so why not the environment? There are just as many problems, if not more, that have to do with the environment. Frankly, the environment is the root of the poor economy, poor health, and almost everything else. So yes, you should be alarmed. You should be scared. And you should be excited to create solutions and care about your home.

[@noahreed9091]

How does he talk for 10 minutes straight and keep his cool? I could never do that.

[@philiphan2145]

you do know that the video is edited right....

[@simoncolson6664]

nope he didn't

[@austinbevis4266]

Jump cuts

[@1paupingson]

Hey! I just voted @TheCrashCourse in the shorty award! They deserve an award! :)

[@Shellewell]

When you said "we could never ever ever duplicate" my mind immediately went "getting back together."

[@soniaseth6085]

It helps me in my online work

[@gaming_with_coral1705]

Sonia Seth LOL

[@thechloeproject3514]

My teacher showed this video in class. It was good.👍

[@thechloeproject3514]

Just in case you want to know it's a 6th grade class.

[@erika-wp4ft]

Whut. I'm Year 1 and teacher also showed this in class.

[@claire5823]

...year 1?

[@keii2596]

The Chloe Project 😂

[@keii2596]

The Chloe Project 😂

[@moaadm4620]

Thank you for helping me right my essay.

[@koofaya]

In Poland we have increased the total area of forests from 20% to around 30% since WWIII. So it's possible to do something good for the climate and quality of living while still being able to make good profit out of it. For an example, we make a lot of furniture for Ikea. Currently we're having problems with overpopulation of boars (300,000 of them) so reforestation is not only good for wood but also for food... =)

[@koofaya]

***** Yes, because we went to the future, seen all the shit, came back and planted loads of trees!

[@laramads5101]

WWIII? You from the future or something? XP

[@beatrizfitz8061]

Nerd

[@tebwebweterikaua8272]

i really like this cuz it helps us what to solve any problems that our environment face

[@WilliamLetzkus]

Excellent series!

[@xanomaly1]

Good idea on this two-parter! Thanks

[@theguywholovespie2118]

SAVE A COW, A FEW TREES, AN ECOSYSTEM. GROW A POTATO.

[@Shimamon27]

A kawaii potato~~~

[@theguywholovespie2118]

If you insist...

[@Shimamon27]

***** :3

[@jacobkleeman5708]

i like potatoes

[@uvraged9854]

I do grow potatoes.

[@thomasrocha4891]

See Allan Savory's TED Talk on reversing desertification. It was very enlightening, and was one of those things that seem so obvious after you hear it.

[@Alitari]

A recent thing I saw going around Facebook ... you show someone from the past an iPhone and say "With this device I can access entire libraries of knowledge from out of thin air ... and yet I use it to look at pictures of cats and get into arguments with people I will never meet."

[@roidroid]

Robert Freitas ran some numbers and worked out that if the Planet had 100 Billion people on it, each person could consume a constant of 10 KW of energy before the climate would start to worry about dissipating all the heat. The calculations were in reference to nanobots, 100 billion people could safely have 10 KW of active nanobots each, on average. (They would also have a lot of inactive nanobots too, but they mostly just act as structural material when inactive. Think: motors and beams)

[@Alfaneroruiz]

really liking it your videos!!!! Thanks a lot for uploading such nice videos.

[@nisbahmumtaz909]

You know what's more important than trying to find out flaws in others' claim? By actually listening to them first before putting our own claims on the table. John Green specifically told us that it's pointless to disprove for the sake of argument, unless the person arguing is inherently wrong.

[@talyah23]

And in August 2019 this video becomes incredibly sad that 6 years on we watch the Amazon being burned due to agriculture and our obsession with consuming meat/animals. We never learn and therefore deserve the extinction we are bringing on.

[@mariaalzarooni3995]

Thank you veeerrrrry much You saved me ... I didn't understand this lesson in the school and we have term exams tomorrow Thank you again

[@keldibekkozhoev2910]

thanks , this video helped me a lot on my project in school !!!

[@ninjanerdstudent6937]

My lazy professor linked our class to this video as well as other videos.

[@emmystein]

I'm in university and I catch myself watching his science videos for fun....:p

[@martinandthegreenguitar5183]

Excellent video! Gotta show my kids!

[@detonatorJE]

please make a series on engineering!! :)

[@austininflorida]

You know they're brothers, right? They've been doing vlogs for the same amount of time and we're both instrumental in creating thin series. If anything, Hank has done more for Crash Course and Sci Show than John has.

[@awddwa6544]

FACT: If all humans stop breathing, Earth will be saved.

[@supaboi9]

God: Oh my god! Why didnt I think of that!

[@stevekeres]

Thank you for your comment. What I wrote was rude and I stand corrected. John is very funny and penetrating and the subjects he talks about interest me more. Which doesn`t give me the right to judge his brother. Thanks!

[@richardfrancis862]

I wonder what it's like now if this was in 2013. Also, who else is given an assignment with this for geo?

[@williamthegamingkid1538]

Nice video

[@pia_om]

haha awesome you guys did this so well :)!

[@niguelmccloud4486]

this video was made 6 years ago and I'm just now learning about it

[@thelastEnderBender]

thanks this is going 2 hlp me on my report.

[@Nt3Hr]

Cheese Whizard what did u get on ur report

[@sofiyachorniy]

For your 'cultural services' point, which you referred to as "less tangible", you may want to look into a book written by Richard Louv: The Last Child in the Woods. It's about the Nature-Deficit disorder, a term coined by Louv to describe the effects a lack of nature has on us as human beings.

[@shezthebestx3]

I think everyone in the entire world should watch this video. it's really sad First Nations came here 25 000 years ago, no TV's, no Computers, no picky eaters or anything. Pure Masculinity. Now, we, humans are single handedly destroying this world and not giving a damn. We should be ashamed we're abusing our intelligence for more landscaping. Don't even get me started about Asia. I know they want to have a son, and it's their religion but honestly we need to start not having children

[@chronofusion]

LOL. ok I'll put it just like George Carlin put it. And THINK for a second when you read this next statement WITH COMMON SENSE...mathematically...chronologically and historically. " The EARTH is NOT going anywhere. WE ARE.lol. This planet has been here for over 400 million years. Humans have been on this planet around 200 to 250 thousand. Do the math. This planet can shake us off like a mild case of fleas anytime it wishes. Earthquakes, tsunami's, hurricanes, tornadoes are all ways in which it does it." It cracks me up everytime I here people bowing down in fear thinking they are afraid they are effecting the lifeforce of this planet when we can't even combat against the planets methods of killing us. Some of us have the nerve to think we are a threat to this great 10 thousand mile wide ball of gases, and soil.

[@jennykapau4845]

chronofusion We are direct and indirect threats to innumerable living things on the planet; and some of us care deeply about them, in addition to how those changes will affect our species. I typically love George Carlin, even saw him in concert; but I hate it when people use that bit of his to mock the legitimate efforts of those of us who care deeply about life on this planet.

[@Aditya-wc9sw]

it's becos of some religion which wants to be the highest followed in he world Cough Islam cough

[@pijushbhowal6214]

Really clear and appreciating explanation

[@rainbowkat1516]

The environment is so strong yet so fragile.

[@fancymushroom.]

the environment is strong, but humans are way more stronger than our environment could ever be...

[@someone-ou3ht]

ecosystem is perfect and the imperfect humans are destroying it's perfection

[@Alitari]

Oh we were talking about per capita ... but if you then introduce a quote, but don't include per capita, it is, as you pointed out earlier about me bringing up water vapour and/or methane, it breaks out of the confines, because by not including it, the phrase can be taken quite differently ... it has to be said in context. Previously I talked about absolute (the 29% total contribution of the USA), not per capita, so keeping everyone from getting confused, is an important thing to do.

[@Biggreeniefun]

Brilliant video!+! "When I say 'effect', I don't mean in a good way." Hah hah hah. Yes, this video is definitely depressing, but it motivates us to fight these changes as much as we possibly can!-!

[@kirstenanoukborger]

This channel is great!!

[@KoriKosmos]

It's nice to be surrounded by happy plants and critters doing their 'business'... sure Hank, if you're into that? o_O

[@LerriHelion33333]

Maan Meher Grow up.

[@KoriKosmos]

Lucas Hollands Do you honestly think that I care, its been 6 months and 8 days since I made this comment. Get a life before commenting on old posts.

[@LerriHelion33333]

Maan Meher I'll comment on whatever post I bloody well choose.

[@KoriKosmos]

Lucas Hollands Sorry, are you still there?

[@LerriHelion33333]

Maan Meher You have offended the culture of my people.

[@taweja]

The problem here is that while our environment is indeed being shaped by human actions, these processes are not under our control, and in some cases lead to natural disasters that serve to remind us how much we're still dependant on nature for our survival. It's a two way street in more than one sense.

[@Amy-lx8ju]

Overpopulation is a big problem but human being can be so selfish. I remember I red in a Christian channel in Spanish promoting having lot of kids. He says that the population is so small that the entire human being specie could be living in Texas. Could you imagine a church leader so ignorant being follow for so many people? It's embarrassing.

[@sciencenotreligion5607]

Naom Chomsky was right when he said the Republican party is the most dangerous organization in human history..and no one knows history like Chomsky

[@Jack-zy6ik]

science not religion

[@WadcaWymiaru]

There is no overpopulation...

[@SHEensya]

Crash course is awesome! Keep rockin’! 😍❤️❤️❤️

[@martin_lopez9515]

Im seeing this in a class :D

[@Alitari]

I understand and agree, I hope you didn't think I thought otherwise. I certainly hope that the previous poster accepts realism and was speaking more from a perception that as science uses a tool from another discipline, such as logic, rather than the error that I saw in their reasoning that if science only observed (which it doesn't) than they'd turn their data over to philosophers to make conclusions as to causation based on the correlations.

[@Bombus_bombus]

What I learned: cows ruin our land

[@kalexambing2507]

You should watch Cowspiracy. I think it's on Netflix.

[@Bombus_bombus]

+Kalexambing I need to watch food inc. too. I think we need to get rid of BPA and petrol based plastics, they're developing plant based biodegradable plastic

[@apearl420]

Doge no humans ruin everything.. cows do not originate from Americas they were transported by Europeans

[@Bombus_bombus]

apearl420 no I agree with that, since we domesticated cows lmao

[@noahreed9091]

Eh, "domesticated" is a little far. If I kidnapped a bunch of wolfs then made them do my bidding, is that domesticating them?

[@MzKie-id1ov]

your videos are good i like them.