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[Date]

ALIQUAM

T H E G R E E N H O U S E E F F E C T

http://environment.about.com/od/globalwarming/a/greenhouse.htm http://cikgubiology.blogspot.com/2009_11_01_archive.html

Life on Earth depends on the Sun’s energy. About 30% of the sunlight is deflected and scattered back into space. The rest reaches the planet's surface and is again reflected upward or is absorbed by the surface. This is the function of the "greenhouse gases.”

We couldn’t live without it!

Greenhouse gases (water vapor, CO2, methane: ~1% of the atmosphere) regulate our climate by trapping heat and acts like a warm-air blanket that surrounds the planet.

Without it, scientists estimate that the average temperature on Earth would be colder by approximately 30 oC, far too cold to sustain our current ecosystem.