What This Summer's Natural Disasters Mean for Planet Earth

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The number of people affected by the massive flooding in Pakistan over the past week is larger than the combined total of the 2004 Indian Ocean tsunami, the 2005 Kashmir earthquake and the 2010 Haiti earthquake. Flash floods have hit neighboring Kashmir, killing at least 85 people, and China where more than 1,300 people are feared missing. In Europe, a heat wave has led to the deaths of 5,000 people, and in Russia drought and wildfires are ravaging the country.

Are all these simultaneous natural disasters this summer just a big coincidence, or is it a harbinger of something more serious for Planet Earth? Environmentalist Bill McKibben connects the dots and finds out how much it has to do with global warming.

Bill McKibben, is author of "Eaarth: Making a Life on a Tough New Planet."