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    As the planet warms up, some scientists argue that we need to consider engineering the Earth’s climate to cool it down. Suggestions include shooting reflective sulfur particles into the atmosphere, building a gigantic parasol to shade the Earth, seeding the oceans with iron, or building forests of artificial trees. How practical are some of these ideas and what about the unintended consequences of tinkering with mother nature? Our guests are ALAN ROBOCK, climatology professor at Rutgers University and MICHAEL MACCRACKEN, chief scientist for Climate Change Programs at the Climate Institute. Listen to the mp3

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