Arctic ice is melting, sea levels are rising, and glaciers are shrinking at alarming rates. And the Earth is getting unmistakably warmer. But is this vast, potentially catastrophic, climate change the result of human behavior? Or is it simply the Earth's natural cycle of warming and cooling periods that have occurred since the planet formed? Make Earth Day last all year with this collection of green documentaries from HISTORY. Experience the formation of the Earth, learn about the various causes for global warming, and travel over one thousand years into the future to study the fate of mankind's footprint. These four popular specials help viewers understand the problems the planet faces and its possible fate.moreless
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