Global warming is the gradual increase in global temperatures caused by the emission of gases that trap the sun's heat in the Earth's atmosphere. Gases that contribute to global warming include carbon dioxide, methane, nitrous oxides, sulfur hexafluoride chlorofluorocarbons (CFCs), and halocarbons (the replacements for CFCs).
There are many causes of global warming and several ways to emit greenhouse gases. Fossil fuels, cars, smokestacks, excessive tilling of new land, and population growth in general.
There have been many attempts to call this problem to global awareness, and even the UNFCCC has done something. The Kyoto Protocol mandates that all ratifying countries reduce emissions of the above six greenhouse gases.
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