A ‘sun umbrella’ attached to an asteroid? How this sci-fi solution to climate change would work

Solar shields are a decades-old concept. But this new iteration solves a long-time pain point.

With the accelerating pace of global warming, the Earth is set to warm by 2.7 degrees Fahrenheit by 2050, and up to 7.2 degrees Fahrenheit by 2100. In that scenario, oceans could boil, killing fish and decimating coral reefs. Severe heat would bring mass drought, make outdoor work intolerable, and turn a lot of land into desert that won’t sustain food cultivation. Millions would be forced to evacuate flood zones, as ice sheets melt and sea levels rise.

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