I love this idea of a sun-shade at the L1 Lagrange point http://www.webpages.uidaho.edu/envs501/downloads/Geoengineering%20SCIAM%202008.pdf … https://www.pnas.org/content/103/46/17184 … But how to offset the cost? Mine BTC out at L1 w/ massive solar power and cooling? Seems insane, but then you see things like https://www.planetaryresources.com/2018/10/consensys-acquires-planetary-resources/ … and think "what if..."
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DACCS looks like the only thing that will work at the scale we need, unless someone figures out how to do ocean liming in a way that helps the local environment by reducing acidity. Fortunately DAC can be done at <$100/ton ($1/gallon), so it’ll be viable for aviation etc.
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