It's a simple idea, but would be hell to implement...though probably easier than what will have to be done to reverse climate change conventionally. What's this idea, you ask?
Kinda like an SEIV sphereworld (see, I managed to make it so it isn't totally OT!
). Build a massive metallic framework around the entire world, out in space a couple hundred kilometers. Around this framework contruct a thin structure about 511,185,932 square kilometers in area, constructed to completely envelop the Earth. That way, you could block out sunlight in whatever amount* you want, reducing overall global temperatures without worrying as much about carbon emissions.
*A major problem would be to find a way to have this structure selectively eliminate the sunlight when you want. I suppose a system sorta like slats on a window blind might work.
Please feel free to show me the massive flaws in my logic.
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OT: I know how to solve global warming
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