““Global warming” refers to the global-average temperature increase that has been observed over the last one hundred years or more. But to many politicians and the public, the term carries the implication that mankind is responsible for that warming. This website describes evidence from my group’s government-funded research that suggests global warming is mostly natural, and that the climate system is quite insensitive to humanity’s greenhouse gas emissions and aerosol pollution. Believe it or not, very little research has ever been funded to search for natural mechanisms of warming…it has simply been assumed that global warming is manmade. This assumption is rather easy for scientists since we do not have enough accurate global data for a long enough period of time to see whether there are natural warming mechanisms at work.”

— Roy Spencer

Global Warming: Natural or Manmade? http://www.drroyspencer.com/global-warming-natural-or-manmade/

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Roy Spencer 2

American meteorologist 1955

Ian Plimer book Heaven and Earth

Heaven and Earth (2009)

“"Global warming" suggests a steady linear increase in temperature, but since that isn't happening, proponents have shifted to the more universal term "climate change," which can be liberally applied to just about anything observable in the atmosphere.”

Anthony Watts (1958) American television meteorologist

Climate Change without Catastrophe: Interview with Anthony Watts http://oilprice.com/Interviews/Climate-Change-without-Catastrophe-Interview-with-Anthony-Watts.html, oilprice.com, 11 March, 2013.
2013

“On the unfalsifiable theory of global warming:"Evidence that contradicts the global warming theory, climate kooks enlist as evidence for the correctness of their theory; every permutation in weather patterns—warm or cold—is said to be a consequence of that warming or proof of it.”

Ilana Mercer South African writer

"Reincarnation of the Reds," http://www.ilanamercer.com/phprunner/public_article_list_view.php?editid1=108 WorldNetDaily.com, December 29, 2006, The Colorado Springs Gazette, January 17, 2007, and The Orange County Register, "The Reds Have Become Greens," January 19, 2007.
2000s, 2007

“The hypothesis that human emissions of CO2 can create global warming can be tested by measurement. … No warming has occured since 1998. … During that time atmospheric CO2 has increased. … The test of the hypothesis above shows that there is no relationship between measured temperature and CO2 emissions. The hypothesis fails.”

Ian Plimer book Heaven and Earth

Heaven and Earth (2009)

“Curiously, aerosol pollution of the northern hemisphere reduces global warming by reflecting sunlight back to space. This "global dimming" is transient and could disappear in a few days like the smoke that it is, leaving us fully exposed to the heat of the global greenhouse. We are in a fool's climate, accidentally kept cool by smoke, and before this century is over billions of us will die and the few breeding pairs of people that survive will be in the Arctic where the climate remains tolerable.”

James E. Lovelock (1919) independent scientist, environmentalist and futurist

"James Lovelock: The Earth is about to catch a morbid fever that may last as long as 100,000 years" The Independent (January 16, 2006)

“Mars has global warming, but without a greenhouse and without the participation of Martians. These parallel global warmings -- observed simultaneously on Mars and on Earth -- can only be a straightline consequence of the effect of the one same factor: a long-time change in solar irradiance.”

Khabibullo Abdusamatov (1940) Russian astrophysicist

as quoted by Lawrence Solomon in Look to Mars for the truth on global warming http://www.canada.com/nationalpost/story.html?id=edae9952-3c3e-47ba-913f-7359a5c7f723&k=0/, National Post, January 26, 2007.