Global Warming 101

Global Warming 101: "Global Warming 101
Global warming is already under way. The urgency of taking action becomes clearer with each new scientific study.
Global warming is caused primarily by carbon dioxide and other heat-trapping emissions from our burning of fossil fuels (when we drive cars or generate electricity) and our clearing of forests. These emissions remain in our atmosphere for decades or even centuries.
Although heat-trapping emissions result from both human and natural causes, there is concrete evidence that most of the warming over the last 50 years is due to our own actions.[1] Recent studies have confirmed that current carbon dioxide levels in the atmosphere are the highest they have been in the last 650,000 years.[2] [3] [4]"