Twenty years after An Inconvenient Truth made a devastating case for climate action, American leadership on the issue has all but vanished. But former Vice President Al Gore, the film’s crusading star, hasn’t given up hope.

In a sit-down interview with Reveal’s Al Letson this week, Gore returned to a familiar theme from across his career in activism: people-powered change. “Sometimes the time frames, the time cycles, take a little........

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