Fossil fuels are natural resources-they will renew over the life-span of the earth, but take much longer to form than the resources that are renewable in our lifetime. They produce much more energy because they are the result of millions of years of compression and compacting of the resource so that it is ultra compact. Dead plants and animals from 300 million years ago decomposed and eventually turned into fossil fuels. The amount of energy we derive from these fuels depends directly on how old the deposits are, deposits that are 300 million years old are 95% carbon (which is what turns into energy), while deposits that are 150 million years old are only 25% carbon.
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