Back in the last report in 2007, the IPCC said it was very likely that humans were the primary cause of warming. Now they say it's extremely likely that it's us. To put "extremely likely" into numbers, that means between 95 to 99 percent sure, about as sure as scientists are that smoking causes cancer.
Most of us have already made peace with that part, and are ready to change -- 60 percent of Americans agree clean renewable energy is the future. But our willingness to do the right thing for ourselves and the planet is being undermined by the slow response of our own Environmental Protection Agency.