Brazil holds one-third of the world’s remaining tropical rainforest and until recently it absorbed as much CO2 pollution every year as the amount produced by all the cars on the planet. Now scientists fear that deforestation and climate change are pushing the forest to a tipping point beyond which it will actually release more CO2 into the atmosphere than it captures. Credit: Sam Eaton/The World
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.