“But while sulfates can lower global temperatures, they don’t do anything to actually remove CO2 from the atmosphere. If spraying ever stops, temperatures would jump. Another proposal, called Project Vesta, seeks to mimic a natural method of removing carbon that normally works over millions of years. It involves grinding up a mineral called olivine and spreading it on tropical beaches, where it combines with CO2, washes out to sea, and falls to the ocean floor.

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