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Dictionary

green'house effect"

1. an atmospheric heating phenomenon, caused by short-wave solar radiation being readily transmitted inward through the earth's atmosphere but longer-wavelength heat radiation less readily transmitted outward, owing to its absorption by atmospheric carbon dioxide, water vapor, methane, and other gases; thus, the rising level of carbon dioxide is viewed with concern.
2. such a phenomenon on another planet.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

greenhouse

greenhouse gas

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