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Additional
greenhouse gas
English Wikipedia - The Free Encyclopedia
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Greenhouse gas
A
greenhouse gas
(sometimes abbreviated
GHG
) is a
gas
in an atmosphere that
absorbs
and
emits
radiation within the
thermal infrared
range. This process is the fundamental cause of the
greenhouse effect
. The primary greenhouse gases in
Earth's atmosphere
are
water vapor
,
carbon dioxide
,
methane
,
nitrous oxide
, and
ozone
. Without greenhouse gases, the average temperature of
Earth's surface
would be about 15 °C (27 °F) colder than the present average of . In the
Solar System
, the atmospheres of
Venus
,
Mars
and
Titan
also contain gases that cause a greenhouse effect.
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