Sun shade to fight climate change for $5bn a year

Posted by Reuters: Alister Doyle and David Fogarty on September 3rd, 2012
Reuters: Planes or airships could carry sun-dimming materials high into the atmosphere for an affordable price tag of below $5 billion a year as a way to slow climate change, a study indicated on Friday. Guns, rockets or a pipeline into the stratosphere would be more expensive but generally far cheaper than policies to cut world greenhouse gas emissions, estimated to cost between $200 billion and $2 trillion a year by 2030. Transporting a million tons of particles to at least 18km above the Earth every......

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