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Will it? It's merely a proposed idea. There are uncertainties: https://en.wikipedia.org/wiki/Stratospheric_aerosol_injectio...

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As well as other possible side effects such as: ozone depletion, stratospheric temperature change, deposition and acid rain, effects on crop yields, etc. [1]

[1] https://en.wikipedia.org/wiki/Stratospheric_aerosol_injectio...

Countries will obviously start taking risks with uncertainties when it becomes certain that they risk destruction due to rising heat.

Is that obvious? The proposed method has the possible side effect of ozone depletion. Increasing UV creates a whole new set of problems.

Pretty obvious that if a billion people finds themselves in the conditions that the article describes they will take drastic measures.

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