How do we know global warming is real?
Question
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Answer ( 1 )
Carbon dioxide is a greenhouse gas, as are methane, nitrous oxide, water vapor, and a host of other trace gases. They occur naturally in the atmosphere. Greenhouse gases act like a blanket for infrared radiation, retaining radiative energy
near the surface that would otherwise escape directly to space. An increase in atmospheric concentrations of carbon dioxide and of other greenhouse gases augments the natural greenhouse effect; it increases the radiative energy available to Earth’s surface and to the lower atmosphere. Unless compensated for by other processes, the increase in radiative energy available
to the surface and the lower atmosphere leads to warming. This we know.