It is going to be a major challenge for the developing countries.
So tell me, Sir David, just how would we force the developing countries (China just happens to be among them; you know, 1.2 billion people or so) to institute these measures?
Is it something that would cause countries to go to war? I can just see the headlines: Battle of the Average Temperature Curve.
What would United States Army recruitment posters look like? Uncle Sam Wants YOU to Persuade Our East Asian Brothers and Sisters That They Shouldn't Use Outdoor Cooking Fires. It's too awful to contemplate.