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Sunshields may seem to be absurdly speculative but technological fixes are probably the only tactics with a reasonable chance of implementation. International agreement to limit carbon emissions relies on states agreeing that:

1. There is a problem
2. That a particular set of values comprises a solution
3. That the proposed solution doesn’t disadvantage any particular state

The sciences of complex systems stand little chance of generating consensus amongst advisors, let alone executives. Technological fixes are probably all we can reasonably expect in the time available.