Amazon’s carbon tipping point, prison segregation, laser archaeology | WBEZ
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Amazon's carbon tipping point, prison segregation, laser archaeology

The Amazon rainforest used to absorb greenhouse gases. Now it may be emitting them and that's bad news for the climate. Reporter Sam Eaton has more. Plus, Inside California prisons, inmates have been segregating themselves along ethnic and racial lines. And, a laser has helped reveal a lost civilization.

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