[quasisphere]

I think one aspect of climate engineering that I don't see discussed very much is who is allowed to do that: Is a single country permitted to make decisions that affect the whole globe? Who decides how hot/cold the earth should be?

Just as an example, some African countries could decide that in fact they would like to make the climate even colder than it used to be, which on the other hand would negatively impact agriculture away from equator. I think these questions form a big potential source of global power struggle and conflict.