Sure, who do we kill or sterilize? Because that is what it boils down to, either low class people from your society are chosen or some other people over there.

Sure, who do we kill or sterilize? Because that is what it boils down to, either low class people from your society are chosen or some other people over there. With the other people over there, good luck! because they sure as hell don't want to stop living. As for your own lower class, good luck! because they already see that the people in charge are massive hypocrites(i.e. in order to stop climate change we need to reduce air travel! Oh but we all need to take private jets to the conference in Egypt...but our work there will more than make up for the carbon we use...)