Saving the Planet in 'Before the Flood.' Behind the Scenes at the Lopate Show.

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In the Arctic- Leonardo Interview with Enric Sala about meltwater. For two years, Leonardo DiCaprio has criss-crossed the planet in his role as UN messenger of Peace on Climate Change.

Academy Award-winning filmmaker Fisher Stevens talks about his new environmental documentary, “Before the Flood,” hosted by Leonardo DiCaprio. On today's Please Explain, we're taking you behind the scenes, sharing the best stories and answering your questions about The Leonard Lopate Show!