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"To block the necessary amount of solar radiation, the shade would have to be about a million square miles, roughly the size of Argentina, Dr. Rozen said."

"Dr. Rozen said his team was ready to design a prototype shade of 100 square feet and is seeking between $10 million and $20 million to fund the demonstration."

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In a better world, if every country agreed not to destroy each other for a decade and applied their defense budgets, it's doable. Global defense budget is approximately 2.2 trillion as of 2022, according to Statista. Granted, that would cause of a lot of unemployment.

Unclear whether a crash decarbonization program would be more or less expensive than that, though.

Whereas sulfate dispersal in the stratosphere would cost about 700 million per year. Over three orders of magnitude less money.

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