global warming

Global warming is the term used to describe an increase in the average temperature of the Earth's atmosphere and its oceans, a change that is believed to be permanently altering the Earth’s climate. The scientific consensus on climatic change related to global warming is that the average temperature of the Earth has risen between 0.4 and 0.8 °C over the past 100 years. The increased volumes of carbon dioxide and other greenhouse gases released by the burning of fossil fuels, land clearing, agriculture, and other human activities, are the primary causes of the global warming that has occurred over the past 50 years.

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(adapted from) http://www.livescience.com/topics/global-warming/
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