The Most Significant Greenhouse Gas Is

Question

The most significant greenhouse gas is
A) water vapor.
B) carbon dioxide.
C) methane.
D) nitrous oxide.
E) chlorofluorocarbons.

Accepted Answer

Water vapor is the most significant greenhouse gas in terms of its contribution to the Earth's natural greenhouse effect, though it acts as a feedback rather than a forcing. Its concentration in the atmosphere is largely controlled by temperature.