NPR News: 'An Inconvenient Sequel' Is An Effective, Cautiously Optimistic, 'I Told You So'

'An Inconvenient Sequel' Is An Effective, Cautiously Optimistic, 'I Told You So'
In 2006, Al Gore issued a forceful warning about the threat of climate change in An Inconvenient Truth. He's followed it up with a sequel that shows how far we've come — but with plenty of caveats.

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