1. Carbon dioxide and greenhouse effect
The greenhouse effect is the rise in temperature that the Earth experiences because certain gases in the atmosphere (water vapor, carbon dioxide, nitrous oxide, and methane) trap energy from the sun. ... The atmosphere contains carbon dioxide in variable amounts, usually 3 to 4 parts per 10,000, and has been increasing by 0.4 percent a year. ... This increase accounts for only half of the estimated amount of carbon dioxide poured into the atmosphere. ...
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