carbon dioxide

Known as CO2, carbon dioxide is the primary element that is released from human activities. The leading source of carbon dioxide emission is the burning of fossil fuels that are needed for transportation and energy. Since the Industrial Revolution began around 1750, human activities have contributed substantially to climate change by adding CO2 and other heat-trapping gases to the atmosphere.

Citation: 
http://www.epa.gov/climatechange/ghgemissions/gases/co2.html
English

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