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Greenhouse Effect — by Joe Baylis — last modified Dec 05, 2009 03:30 PM

A phenomenon that results in the heating of the Earth as radiation (heat and light) from the sun is trapped within the atmosphere.

Global Warming — by Mark Kragh — last modified Dec 05, 2009 03:31 PM

Global warming is the increase in the average temperature of the Earth's near-surface air and oceans since the mid-20th century and its projected continuation.