1. Athena Sustainable Materials Institute (2015), Ecocalculator acquired on 12/15/30 from http://www.athenasmi.org/our-software-data/ecocalculator/.
2. EIO-LCA, Carnegie Melon University acquired on 1-3-14 from http://www.eiolca.net/.
3. EPA, National Action Plan for Energy Efficiency (2010), retrieved on December 27, 2014 from http://www.epa.gov/cleanenergy/energy-programs/suca/resources.html.
4. DoE, News, Archives and Events, Dec 2, 2009, President Obama Sets a Target for Cutting U.S. Greenhouse Gas Emissions, retrieved on Dec 29, 2014 from http://apps1.eere.energy.gov/news/news_detail.cfm/news_id=15650.
5. EPA (2012), Climate Change Indicators in the US acquired on 1/30/14 from http://www.epa.gov/climatechange/science/indicators/download.html.