Steve Milloy writes a weekly "Junk Science" column for Fox News, which he uses, among other topics, to pour scorn on studies documenting the medical effects of secondhand tobacco smoke and showing that climate change is taking place. Fox describes his credentials thus: "Steven Milloy publishes JunkScience.com and manages the Free Enterprise Action Fund. He is a junk science expert, and an adjunct scholar at the Competitive Enterprise Institute".
What it doesn't say is that he has long acted as a paid advocate for the tobacco company Philip Morris, while the fake grassroots group he runs has also received funding from ExxonMobil. His website has been the main entrepôt for almost every kind of climate change denial that has found its way into the mainstream press. Milloy claims to be campaigning against "faulty scientific data and analysis used to advance special and, often, hidden agendas", which seems to be a pretty good summary of his own activities.
Michaels played a starring role in Channel 4's The Great Global Warming Swindle and is regularly used by the US media, largely because he is one of the very few deniers who has any relevant scientific credentials. He maintains that: "When it comes to global warming, apparently the truth is inconvenient. And it's not just Gore's movie that's fiction. It's the rhetoric of the Congress and the chief executive, too."
Something he is less keen to reveal is that, as a leaked memo from an electricity company shows, he has recently been paid at least $100,000 by companies involved in coal-fired power production to make the public case against climate change. In 2007 Michaels withdrew as an expert witness from a court case about climate change, after it became clear that his other sources of funding could be revealed to the public.
EDIT
Mel P (Genuinely Scary Spice) appears to believe that half the scientists on earth are engaged in a series of giant conspiracies. Like Christopher Booker (below), she dismisses not only climate change but also the entire canon of evolutionary science. She also stoutly defends the thesis that MMR injections cause autism.
She claims that "the theory that global warming is all the fault of mankind is a massive scam based on flawed computer modelling, bad science and an anti-western ideology … The majority of well-meaning opinion in the Western world believes a pack of lies and propaganda". She has also maintained that "carbon dioxide forms a relatively small proportion of the atmosphere, most of which consists of water vapour." If this were the case, we would need gills.
Much, much more at:
http://www.guardian.co.uk/environment/georgemonbiot/2009/mar/06/climate-change-deniers-top-10