Fossil fuels were never invented, they were discovered. Some people think that coal may have been used as fuel in prehistoric times.
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Fossil fuels.
Mainly two reasons. (1) The fossil fuels will eventually be used up. (2) Fossil fuels cause pollution.
We use fossil fuels all the time and we will keep using them. You should really just cut back on how many fossil fuels you are using. Unplug plugs when your not using them etc, etc I hope this helped
hydrogen
Wind.