The Mars example: An atmosphere consisting of 95% carbon dioxide traps so much heat that the average nighttime low is -200F

Atmosphere of Mars - Wikipedia, the free encyclopedia

The atmosphere on Mars consists of 95% carbon dioxide

Flashing & Splashing Later (slight severe risk; another Canadian transfusion on the way - worst of the heat is behind us now)

-200 F. Average nighttime low on Mars.

Christian climatologist tackles God and global warming at Hardin-Simmons University : Abilene Reporter-News

As a blanket keeps one warm by trapping body heat, the atmosphere traps the earth's heat and doesn't let it escape into space, [Hayhoe] said.