What does the chart below tell us about greenhouse gases (GHGs) in Earth's atmosphere? ABSORPTION SPECTRA FOR MAJOR NATURAL GREENHOUSE GASES IN THE EARTH'S ATMOSPHERE IAftor J. N. Howard, 1959: Proc. LR.E. 47, 1459; and R. M. Goody and C. D. Robinson, 1951: Ouart. J. Roy. Meteoral, Soc. 77, 153] GHGs mostly absorb UV (shortwave) radiation GHGs mostly absorb infrared (longwave) radiation GHGs reflect more radiation than they absorb GHGs have increasing concentrations over time .