Pies in the Sky: A Solution to Global Warming?

Angel suggests that the shield, covering an area of 4.7 million square kilometers (slightly smaller than the area of the continental United States west of the Mississippi River), would be best made as a cloud of 16 trillion free-flying circular refractors, each 0.6 meter (2 feet) in diameter. . Each refractor would be about 5 microns thick and weigh 1.2 grams. The refractors would be launched in stacks and then deployed upon reaching the target zone.

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