Amy L. Luers (Union of Concerned Scientists),Michael D. Mastrandrea (Stanford Woods Institute for the Environment),Katharine Hayhoe (Texas Tech University Department of Geosciences),Peter C. Frumhoff (Union of Concerned Scientists) 2007: How to Avoid Dangerous Climate Change: A Target for U.S. Emissions Reductions, <http://www.ucsusa.org/assets/documents/global_warming/emissions-target-report.pdf>