hydrogen
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Mainly two reasons. (1) The fossil fuels will eventually be used up. (2) Fossil fuels cause pollution.
Fossil fuels.
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
Wind.
Petroleum is called "fossil fuel." Fossil fuels are made after a long time out of decaying organisms. Because it takes so long to create fossil fuels, and because it isn't taking us long to use fossil fuels, they are limited. How much petroleum we have left is unknown, but there is a limit.