US considers 'sun blocking' to cool the Earth: What is it and does it really work?

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What is sun blocking and does it really work?

https://www.euronews.com/green/2023/07/05/sun-blockers-us-scientists-aim-to-cool-the-earth-by-reflecting-sunlight-into-space

A White House report confirms that the US is open to researching solar radiation modification, or sun blocking.