The absorptions of the principal natural greenhouse gases are concentrated in two belts. Gases such as CO2 and CH4 (along with less abundant hydrocarbons) absorb at wavelengths longer than this window due to the presence of relatively long C-H and carbonyl bonds. The bonds of H2O and NH3 absorb at wavelengths shorter than 8 micrometres. Except for the bonds in O3, no bonds between carbon, hydrogen, oxygen and nitrogen atoms absorb between these two ranges. This means that most of the radiation emitted by the earth's surface at wavelengths within in the atmospheric window pass through the Earth's atmosphere without heating it; instead, this radiation is emitted into space. Without this window, the Earth would become much too warm to support life, and possibly so warm that it would lose its
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| - The absorptions of the principal natural greenhouse gases are concentrated in two belts. Gases such as CO2 and CH4 (along with less abundant hydrocarbons) absorb at wavelengths longer than this window due to the presence of relatively long C-H and carbonyl bonds. The bonds of H2O and NH3 absorb at wavelengths shorter than 8 micrometres. Except for the bonds in O3, no bonds between carbon, hydrogen, oxygen and nitrogen atoms absorb between these two ranges. This means that most of the radiation emitted by the earth's surface at wavelengths within in the atmospheric window pass through the Earth's atmosphere without heating it; instead, this radiation is emitted into space. Without this window, the Earth would become much too warm to support life, and possibly so warm that it would lose its
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| abstract
| - The absorptions of the principal natural greenhouse gases are concentrated in two belts. Gases such as CO2 and CH4 (along with less abundant hydrocarbons) absorb at wavelengths longer than this window due to the presence of relatively long C-H and carbonyl bonds. The bonds of H2O and NH3 absorb at wavelengths shorter than 8 micrometres. Except for the bonds in O3, no bonds between carbon, hydrogen, oxygen and nitrogen atoms absorb between these two ranges. This means that most of the radiation emitted by the earth's surface at wavelengths within in the atmospheric window pass through the Earth's atmosphere without heating it; instead, this radiation is emitted into space. Without this window, the Earth would become much too warm to support life, and possibly so warm that it would lose its water as Venus did early in solar system history. Thus, the existence of a window in the electromagnetic spectrum is critical to Earth remaining a habitable planet.
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