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Bernie Sanders responds to his critics
The Democratic presidential candidate has been called out of touch for asserting that climate change is the greatest threat to national security.
All In Climate Change
Will we begin to fear the ocean?07:35
Barrow, AK: The leading edge of climate change06:52
The Vanishing Island07:36
Farming through a drought07:12
Conundrums of the California drought05:42
The solar boom05:01