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Biodiversity

The variety of life in the world or in a particular habitat or ecosystem.

Greenhouse Effect

A natural process where greenhouse gases trap heat in the Earth's atmosphere.

Acid Rain

Rainfall made sufficiently acidic by atmospheric pollution that it causes environmental harm, typically to forests and lakes.

Global Warming

The gradual increase in the overall temperature of the earth's atmosphere generally attributed to the greenhouse effect caused by increased levels of carbon dioxide, CFCs, and other pollutants.