A presentation about biofuels Energy hungry world

It is thought by many of today’s leading scientists that biofuel is one solution to our future energy needs. Biofuel involves chemical energy
such as wood, crops, animal and even human waste.
The organic matter thermally, chemically or biochemically into energy-containing substances which can be stored in either solid, liquid or gas form, depending on .
An example of biochemical conversion is the use of bacteria to break down organic matter, which __ , which in turn can be used as a fuel.
Among a number of potential uses as a fuel, hydrogen __ as a means of powering or propelling vehicles and other modes of transport.
A number of hydrogen-powered cars _.