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Open relationships are no vestige of the swinging seventies. Although we don't know how many people have opened up, sex-educator Tristan Taormino says that you probably know someone in an open relationships, you just might not know that you know.

Taormino tells Steve Paulson that there are myriad manifestations of "open..."

There's a big debate among ecologists right now over whether we can have hope in the face of climate change. Science writer Emma Marris says we need it. And it’s not just newspaper headlines and environmental campaigns that need to change, we need to rethink “nature.”