Oil and coal were created during a period of history before bacteria had evolved to break down dead animal and plant matter. Instead they got crushed under the Earth into a kind of carbon-rich soup. There is only a finite amount of this stuff, because now when algae, plankton, or just about anything dies, bacteria will consume the remains and they don’t stick around long enough to be turned into oil or coal. It’s special because it’s energy rich, and because it’s relatively cheap and simple to release that energy.
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