If U.S. leads the way, EU, Canada and Japan will follow. Then you have over 50% of world GDP behind ecological embargo. So the rest are not too much of a proble

If U.S. leads the way, EU, Canada and Japan will follow. Then you have over 50% of world GDP behind ecological embargo. So the rest are not too much of a problem. If U.S. does nothing, then each individual EU country and Japan and Canada will all be individually too small to do it. EU won't take orders from non-NATO countries. And EU can't risk it's credibility on something that expensive that's not backed by USA. It would fuel exit-populist propaganda too much. Meanwhile USA is not breaking apart in similar fashion. Looking from a Nordic country, this is the only reason why electing Trump would be a sad mistake. Otherwise Trump is just funny.