See RealClimate for the story: The high cost of inaction. The post - on an update of an earlier article by Pacala & Socolow in Science - buries the lede, which is:
"[The 2004-2011] seven years of inaction, even if we immediately begin implementing the ["wedges" climate action] strategy now and fully carry it out over the next century, have larger climatic consequences over the next century than one might expect (namely, "an additional ~50 ppm of CO2 would be added to the atmosphere by 2111.)"- which they estimate would translate to ~0.4 degree C global temperature increase, or .72 degree F.
Inaction today has major repercussions; it's another point unknown to the average citizen.
"Democracy doesn't work if people don't know what is going on."