A study has shown that at least 74 percent of our climate variability is due to human activity.. Since 1950 the average global surface air temperature has increased more than 0.5 degrees Celsius. The way scientists were able to seperate human and natural causes of warming was by analyzing the changes in the balance of heat entering and leaving the Earth. They found that greenhouse gases and particularly carbon dioxide are the main cause of global warming and that carbon dioxide levels have increased incredibly since the pre-industrial times of the world. Very interesting article.
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