Here’s some good news on the climate change front: Greenhouse gas emissions in the United States fell nearly 10 percent from 2005 to 2012 and dropped 3.4 percent in 2012 alone, according to the U.S. Environmental Protection Agency’s (EPA) 19th annual emissions tally. The U.S. is now more than halfway toward meeting its 2020 target of reducing greenhouse gas emissions by 17 percent below 2005 levels.