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those energy sources that are not used up but are replenished in a cycle: wind; solar; water; waves; biofuels.
waste matter that is introduced directly and indirectly into the environment by human activities...
the rate that includes all goods and services and is not adjusted.
goods that are used with another good; an increase in the price of one product will result in a...
the percentage of adults who can read and write effectively in one language.