National Geographic: Global Warming
A National Geographic video that explaiins that for 2.5 million years the Earth climate has fluctuated, cycling from ice ages to warmer periods, but in the last century the planets temperature has risen unusually fast, about 1.2 to 1.4 degrees Fahrenheit. Scientist believe it's human activity that's driving temperatures up, a process known as global warming. For more information, please, watch this video.
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