How does the greenhouse effect work, and what is its relationship to the warming trend? Using animations adapted from NASA, this video produced by ThinkTV demonstrates how naturally-produced greenhouse gases trap the Sun's heat in the lower atmosphere. The greenhouse effect is essential to life on Earth. But scientists fear that a rise in greenhouse gases, caused in part by human activity, is responsible for trapping too much heat and increasing the Earth's average temperature. This warming trend, if unabated, will have serious repercussions worldwide.
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