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Global warming

PBS NewsHour 2014-04-15

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PBS NewsHour 2013-11-27

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PBS NewsHour 2013-09-27

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PBS NewsHour 2012-10-09

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PBS NewsHour 2012-09-17

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PBS NewsHour 2011-12-28

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NewsHour with Jim Lehrer 2009-09-18

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NBC Nightly News With Brian Williams 2011-11-18

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NBC Nightly News With Brian Williams 2011-11-01

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NBC Nightly News 2009-12-04

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