The IDNR posted the 2013 Iowa Greenhouse Gas Inventory Report on their website, the eight greenhouse gas inventory conducted for Iowa. Overall greenhouse gas emissions decreased by 0.51% compared to 2012, and decreased by 6.78% compared to the peak emissions occurring in 2007. Reductions in greenhouse gas emissions are largely attributed to contribution decreases from electric power generation (down 7.37% compared to 2012). The annual report serves to document trends and to track progress in reducing greenhouse gas emissions.