1. Intergovernmental Panel on Climate Change,Climate Change 2007: Mitigation of Climate Change, B. Metz et al., eds., Cambridge University Press, Cambridge, United Kingdom; New York, NY (2007).http://www.ipcc.ch/publications_and_data/ar4/wg3/en/contents.html
2. Millennium Ecosystem Assessment, “Living beyond our means: natural assets and human well-being,” http://www.millenniumassessment.org (2005).