Supporters of geoengineering have proposed radical ways to alter the planet to decrease the level of greenhouse gas emissions. Proposals include creating artificial volcanoes to pollute the atmosphere with sulfur particles, fertilizing the oceans and placing sun-deflecting aluminum foil in the sky. But opposition is growing to geoengineering. We host a debate between Indian environmentalist, scientist, philosopher and eco-feminist, Vandana Shiva, and geopolitical analyst and columnist, Gwynne Dyer.
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