11.   But it is the most abundant greenhouse gas, more prevalent than methane, nitrous oxide or other gases blamed for trapping heat that increasingly warms land and oceans.

12.   But when the train moved, the window slowly closed and the shade slowly fell, trapping the heat inside.

13.   Daniel O. Chellemi, an ARS plant pathologist at the Ft. Pierce laboratory, has shown that the plastic traps heat in the soil in a greenhouse effect.

14.   Global warming occurs when such gases accumulate in the atmosphere, trapping heat.

15.   Greenhouse gases like carbon dioxide from factories and cars trap heat in the atmosphere.

16.   Greenhouse gases -- gases that trap solar heat -- lead to higher average temperatures and, on average, more rain because of increased evaporation from the oceans.

17.   He said global warming is a natural phenomenon, with layers of upper-level gases trapping heat from the sun.

18.   He pulled his sleeping bag over his head, trapping body heat as the wind and snow swirled around him.

19.   In the winter, some films can help keep the home warmer by trapping interior heat.