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It is significant that so much carbon dioxide stays in the atmosphere because CO 2 is the most important gas for controlling Earthâs temperature. Carbon dioxide, methane, and halocarbons are greenhouse gases that absorb a wide range of energyâincluding infrared energy (heat) emitted by the Earthâand then re-emit it.and. Plants on land have taken up approximately 25 percent of the carbon dioxide that humans have put into the atmosphere. The amount of carbon that plants take up varies greatly from year to year, but in general, the worldâs plants have increased the amount of carbon dioxide they absorb since 1960.
Carbon dioxide is the greenhouse gas of most immediate concern, because it is the most concentrated in the atmosphere and because it can persist for over 100 years in the atmosphere once emitted. On a per molecule basis, other gases can trap even more heat than carbon dioxide.