1 The earth’s climate is determined in large part by the presence in the atmosphere of naturally occurring greenhouse gases, including in particular water vapour, carbon dioxide (CO2), methane (CH4), chlorofluorocarbons (CFCs), nitrous oxide (N2O), and tropospheric ozone (O3) (Atmosphere, International Protection). These gases are transparent to incoming shortwave solar radiation but absorb and trap longwave radiation emitted by the earth’s surface. Their presence exerts a warming influence on the earth. This natural greenhouse effect is positive in keeping the...
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