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renewable energy sources
can be replenished naturally
depletable renewable can run out if used too much; Ex-Biomass (charcoal, ethanol, wood)
Nonrenewable Energy Sources
Exist in fixed amounts on earth & can’t easily be replaced or regenerated
Fossil Fuels (good example) Fossilized remains of ancient biomass that take millions of years to form, Coal, Oil, Nat. Gas
key to renewable energy
Rate of use must be at or below rate of regeneration for renewables
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