1.   As the quantity of gases increases, more heat is trapped.

2.   Many scientists blame the warming on industrial pollutants that trap infrared heat in the atmosphere rather than letting it escape into space.

3.   The walls trapped the heat and reflected it back.

4.   An explosion in commercial air traffic may be triggering formation of high-altitude clouds that trap heat and could worsen global warming.

5.   As more and more of the gases build up, more and more heat is trapped by the atmosphere.

6.   Astronomers believe Venus is suffering from a runaway greenhouse effect, its thick carbon dioxide atmosphere trapping heat and creating the hellish conditions now prevailing.

7.   Berg believes the larger culprit is global warming, brought on by increased emissions of greenhouse gases, which trap heat in the atmosphere.

8.   Besides stimulating plant growth, carbon dioxide traps heat in the atmosphere.

9.   All six gases trap heat in the atmosphere, although carbon dioxide is by far the most important.

10.   But its molecular structure traps heat near the planet that would otherwise radiate out to space.