JunkScience.com is a website maintained by Steven J. Milloy, an adjunct scholar at the Cato Institute and the Competitive Enterprise Institute and a columnist for FoxNews.com. In the past Milloy was Director of The Advancement of Sound Science Coalition (TASSC), a front group set up by Philip Morris in 1993 and run by the public relations firm APCO & Associates.
Accoring to Junkscience.com, “Junk science is faulty scientific data and analysis used to advance special interests and hidden agendas.”
Milloy has also said that “'Junk science' is bad science used by lawsuit-happy trial lawyers, the 'food police,' environmental Chicken Littles, power-drunk regulators, and unethical-to-dishonest scientists to fuel specious lawsuits, wacky social and political agendas, and the quest for personal fame and fortune.”
The purpose of JunkScience.com is supposedly to “help distinguish good science from bad.” 
The Consumers Union has defined junk science as a phrase “coined by those practicing public relations and lobbying activities on behalf of some companies in certain industries–particularly the plastics, chemical, biotechnology, and pesticide industries. While its coiners may have legitimate grounds for debate on some issues, the phrase has been used far too often to discredit honest public interest organizations and legitimate scientists who express concerns about consumer safety and environmental risks.” 
Stance on Climate Change
“The relationship between CO2 and temperature is logarithmic in nature – that is, as CO2 increases in the atmosphere, it absorbs less and less additional energy to produce correspondingly less and less additional warming. At some point, adding more CO2 to the atmosphere doesn't significantly change atmospheric temperature.” 
Although they do not list funding sources on their website, JunkScience.com places no restrictions on who can donate.
According to Greenpeace's ExxonSecrets, the site was sponsored by “Citizens for Integrity in Science,” a group that existed only on paper and whose website was registered to Milloy's home address in Potomac. 
May 21 - 23, 2012
“About Junk Science: FAQs,” Junkscience.com. Archived February 8, 2009.
“Consumers Union Statement about Consumer Distorts,” Consumers Union, December 1999.
Steven Milloy. “The Greenhouse Myth,” FoxNews.com, April 20, 2006.
“Cosponsors,” 7th International Conference on Climate Change. Accessed May 12, 2012.
“About,” Globalwarming.org. Accessed May, 2012.
“Junk Science,” SourceWatch.
“Deniers:Organisations:Junkscience.com,” ExxonSecrets Wiki.