Greenhouse Gas Emissions Rise 2% in 2013.

"After two years of decline, total U.S. greenhouse gas emissions released into the atmosphere because of human activity increased 2 percent in 2013 over the previous year. That surge was fueled, in large part, because of a growing economy, falling coal prices and a cold winter, the U.S. Environmental Protection Agency announced Thursday in its annual greenhouse gas emissions inventory."

U.S. Greenhouse Gas Pollution Jumped 2 Percent in 2013. Scientific American. Bobby Magill and Climate Central. April 16, 2015. http://www.scientificamerican.com/article/u-s-greenhouse-gas-pollution-jumped-2-percent-in-2013/