<P> A greenhouse gas is a gas that absorbs and emits radiant energy within the thermal infrared range . Increasing greenhouse gas emissions cause the greenhouse effect . The primary greenhouse gases in Earth 's atmosphere are water vapor , carbon dioxide , methane , nitrous oxide and ozone . Without greenhouse gases , the average temperature of Earth 's surface would be about − 18 ° C ( 0 ° F ) , rather than the present average of 15 ° C ( 59 ° F ) . The atmospheres of Venus , Mars and Titan also contain greenhouse gases . </P>
<P> A greenhouse gas is a gas that absorbs and emits radiant energy within the thermal infrared range . Increasing greenhouse gas emissions cause the greenhouse effect . The primary greenhouse gases in Earth 's atmosphere are water vapor , carbon dioxide , methane , nitrous oxide and ozone . Without greenhouse gases , the average temperature of Earth 's surface would be about − 18 ° C ( 0 ° F ) , rather than the present average of 15 ° C ( 59 ° F ) . The atmospheres of Venus , Mars and Titan also contain greenhouse gases . </P>
the 2 most abundant gases in our atmosphere
the 2 most abundant gases in our atmosphere
water vapor carbon dioxide methane nitrous oxide ozone
water vapor carbon dioxide methane nitrous oxide ozone