Cross-posted from the Center for American Progress. The world’s leading economic powers remain inactive in preventing an increase in the serious impacts of climate change. While current impacts of climate change may not have reached alarming proportions, according to the Intergovernmental Panel on Climate Change that will happen soon enough if we do not take early action. What is causing increasing concern, as the December U.N. climate summit in Copenhagen draws ever nearer, is the continuing deadlock in political action to deal with this challenge. There is clear consensus among those arriving in Pittsburgh this week for the G20 that …