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Running time 79:04

Drawing on The State of the Climate in 2009, Deke Arndt, chief of NOAA's Climate Monitoring Branch, presents the preponderance of scientific evidence that climate change is occurring and that humans are the primary cause. He also elaborates on the modern methods that scientists use to monitor many different aspects of Earth's climate system.

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NOAA climate.gov
Osher Lifelong Learning Institute
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