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CO2: average of ppm on Earth
From 1832 to 2004, the atmospheric CO2 concentration increased from 284 ppmv* to 377 ppmv, or about 33%, with most of the change occurring since 1970. Burning fossil fuels such as coal and petroleum is the leading cause of increased man-made CO2; deforestation is the second major cause. - Wikipedia
Global warming, while not completely understood in its causes and potential effects, is attributed by scientist to human activities, and chiefly to greenhouse gases, and is viewed as a severe threat to humanity’s survival.
*ppmv: parts per million by volume, is a unit of measure used to express the concentrations of greenhouse gases in the atmosphere.
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