There's plenty of blame to go around, but there was one country that possessed unique power to change the game. It didn't use it. If Barack Obama had come to Copenhagen with a transformative and inspiring commitment to getting the U.S. economy off fossil fuels, all the other major emitters would have stepped up. The EU, Japan, China and India had all indicated that they were willing to increase their levels of commitment, but only if the U.S. took the lead. Instead of leading, Obama arrived with embarrassingly low targets and the heavy emitters of the world took their cue from him.
(The "deal" that was ultimately rammed through was nothing more than a grubby pact between the world's biggest emitters: I'll pretend that you are doing something about climate change if you pretend that I am too. Deal? Deal.). Read more.