This problem is occuring a lot right now. Power plants that use Coal or oil could pollute the whole earth. The examples could be Smog, Soot, acid rain, or even global warming! The mining of coal also cause a lot of damage to the surface of the earth. One note, They will also run out. So if you care about planet earth, Save electricity, or maybe put a solar panel on the roof and heat your water with it. Or, Sign this petition. It will help a bunch