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Solar Geoengineering: Weighing Costs of Blocking the Sun’s Rays

With prominent scientists now calling for experiments to test whether pumping sulfates into the atmosphere could safely counteract global warming, critics worry that the world community may be moving a step closer to deploying this controversial technology.

Source:  Copyright 2014, Yale Environment 360
Date:  January 9, 2014
Byline:  nicola jones
Original URL: Status ONLINE


In 1991, Mount Pinatubo in the Philippines erupted in one of the largest volcanic blasts of the 20th century. It spat up to 20 million tons of sulfur into the upper atmosphere, shielding the earth from the sun’s rays and causing global temperatures to drop by nearly half a degree Celsius in a single year. That’s more than half of the amount the planet has warmed Studies have shown that such a strategy would be powerful, feasible, fast-acting, and cheap. due to climate change in 130 years.

Now some scientists are thinking about replicating Mount Pinatubo’s dramatic cooling power by intentionally spewing sulfates into the atmosphere to counteract global warming. Studies have shown that such a strategy would be powerful, feasible, fast-acting, and cheap, capable in principle of reversing all of the expected worst-case warming over the next century or longer, all the while increasing plant productivity. Harvard University physicist David Keith, one of the world’s most ...

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