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Renewable energy sources
Can be replenished naturally or at near rate or consumption and reused
Depletable renewables: can run out if overused (wood, charcoal, ethanol)
Nondepletable renewables: don’t run out if overused (solar, wind)
No renewable energy sources
Exist in fixed amount of earth and can’t easily be replaced or regenerated
Fossil fuels: fossilized remains of ancient biomass that take millions of years to form (coal, oil)
Nuclear: energy generated from uranium or other radioactive fuels
rate of consumption
Rate of consumption
-rate of use must be at or below rate of regeneration for renewables
-fossil fuels will run out if they take longer to regenerate than the rate we use them
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