S. Fred Singer is an internationally renowned climate physicist, research professor at George Mason University, and the co-author (with Dennis Avery) of Unstoppable Global Warming, a book which describes the natural 1500-year cycle of ups and downs in the Earth's average air temperature. He is well known for his skepticism toward the theory of anthropogenic global warming.
- Singer was among the very first to study the cosmic radiation outside of the Earth's atmosphere using rocket-borne instruments. He developed the method used to date the origin of meteorites, and demonstrated how the Moon might have been captured to become a companion of the Earth. He pioneered instrumented satellites before Sputnik and devised instruments for measuring ozone and other atmospheric constituents from space. 
- In rebuke to the EPA classifying CO2 a health hazard, Singer says “Its science is based primarily on the United Nation’s Intergovernmental Panel on Climate Change, (and) the IPCC conclusion about the human cause of climate change is not supported by any kind of credible evidence. None whatsever,” 
- Mastering the Problem of Environmental Quality: an interview with Dr. S. Fred Singer
- ‘Climate Change’ Is the Terrorist the U.S. Should Be Fighting, Muslim Leader Says CNSNews, May 19, 2009
- Hot Talk, Cold Science: Global Warming's Unfinished Debate (1997)
- Climate Policy - From Rio to Kyoto (2000)
- Unstoppable Global Warming: Every 1,500 Years (2007) is filled with wit, style and scholarship. It presents surprising statistics that meticulously dissect the claims of well-funded environmental groups and uncovers little-known facts about global warming.