[hackerlight]

> The only unilateral solution seems to be a technological one

Or a political one. Developed countries provide them a small financial incentive to build out renewables instead. Some kind of UN fund. It doesn't have to be a large incentive, it just needs to tip the financial decision over at the margin. The economic logic: it's a retroactive carbon tax, of sorts, given the extreme inequality in emissions per-capita since the industrial revolution. It's also a pragmatic solution, because it's cheaper to prevent the emissions than extract it after they've been released.