China's market turmoil reverberates worldwide. More than 100 people die this week in Europe's ongoing migrant crisis. And the new U.S. envoy for Syria pushes for a political solution to the civil war. A panel of journalists joins Diane for analysis of the week's top international news stories.
Artificial trees to capture carbon, billions of tiny mirrors to reflect sunlight, sulfate to whiten clouds: promise and pitfalls of large scale radical ideas for addressing climate change.
- Eli Kintisch author of "Hack the Planet: Science's Best Hope- or Worst Nightmare - for Averting Climate Catastrophe"
- Margaret Leinen Founder and CEO, The Climate Response Fund
- Robert Jackson Nicholas Chair of Global Environmental Change and a professor in the Biology Department, Duke University
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