Coal!
Coal is a solid mixture of hydrocarbon compounds formed from remains of swamp plants. Coal is often used used for some cars and even to generate electricity. It was even once used to heat homes and for transportation.
Pros
Coal is easy to obtain and is inexpensive.
It also gives humans a lot of electricity.
Cons
Coal is a nonrenewable resourae which means it takes millions on years to get it back.
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