How much Sulfur Dioxide is needed to freeze life on earth?

Injecting sulfur dioxide into the atmosphere has been proposed as a mechanism to relieve the symptoms of global warming by creating a "stratoshield" (a la Mount Pinatubo), reflecting more of the sun's light away from earth. Large amounts of sulfur would be burned and injected high into the atmosphere using tubing suspended from weather balloons.

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How much Sulfur Dioxide is needed to freeze life on earth?

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