In addition, since 2008 the United States has reduced greenhouse gas emissions from Federal Government operations by 17 percent and, under Executive Order 13693 issued on March 25th 2015, has set a new target to reduce these emissions 40 percent below 2005 levels by 2025. Relationship with inventory: This approach, and the definitions and metrics used, are fully consistent with our greenhouse gas inventory. The United States intends to continue to improve its greenhouse gas inventory over time, and may incorporate these improvements into its intended nationally determined contribution accordingly. Additional information on the greenhouse gas inventory, including calculations, models, data sources, and references can be found here: www.epa.gov/climatechange/ghgemissions/usinventoryreport.html#about