¥Notice that because of EarthÕs
greenhouse gases, 91% (=64/70) [195/235 = 83%] of the IR emitted to space comes from the atmosphere and only 9% (=6/70) [40/235 = 17%] comes from
the surface
¥
¥When GHGÕs are added to the atmosphere,
the altitude of IR
emission to space rises
¥In the troposphere, air temperature decreases with altitude
¥So the temperature of the emission to
space decreases
¥So the energy emission to space
decreases because the emission
energy decreases with decreasing
temperature