2007: Open Letter to the Secretary-General of the United Nations (the "2007 Bali open letter"), 100 scientist signers, criticized the IPCC's conclusions and called for a reassessment of climate science. Then UN Secretary General Ban Ki Moon never acknowledged receipt of either the 2007 Bali open letter, or the 2009 Copenhagen Climate Challenge but mail tracking showed he did receive it.
2007: "Independent Summary for Policymakers" questioning the UN IPCC's 4th Assessment report (2007) AR4 and contesting many of its conclusions, organized by the Fraser Institute in Canada: list of 10 authors and reviewed by over 50 scientists worldwide.
2007:Letter to the American Physical Society: A group of physicists sent this open letter criticizing the society's stance on climate change and asking for a reconsideration.
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2006: Open Kyoto to Debate - An open letter to Stephen Harper, Prime Minister of Canada, from 60 climate experts, challenging the scientific basis for climate policies.
2003: Protocol lacks 'credible science' - Open letter to Canadian PM Paul Martin, 46 leading scientists endorsed this, challenging the scientific basis for climate policies.
2002: Open letter to Canadian PM Jean Chretien, 30 scientist signers, challenging the scientific basis for climate policies.
1997: Global Warming Petition Project - organized through the Oregon Institute of Science and Medicine, starting in 1997. That document now claims some 31,487 U.S. scientists and technically qualified signers, 9,029 with PhDs--see breakdown . Scientists, in this case physicist Dr. Edward Teller, signed the statement as follows:

1995: Leipzig Declaration on Climate Change, 80 scientist signers plus 25 TV meteorologists. This declaration questioned the scientific consensus on climate change and opposed the Kyoto Protocol.
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1992: SEPP Statement by Atmospheric Scientists on Greenhouse Warming, 47 signers. The signatories expressed skepticism about the certainty of anthropogenic global warming and opposed environmental regulations based on "highly uncertain scientific theories."
1992:The Heidelberg Appeal: Presented at the Earth Summit in Rio de Janeiro, this appeal questioned the urgency of environmental policies based on what the signatories considered uncertain science.
No list like the above would be complete without including reference to the 15 massive International Conferences on Climate Change put on by The Heartland Institute across the world from 2008 to 2023. Hundreds of climate realist scientists, economists, engineers and policy experts spoke at these meetings, easily the most important climate events ever held.
So how many of these did you see reported in mainstream media? Any? And that is the problem faced by climate skeptics-most mainstream media do not report on these declarations, and, on the rare occasion when they do, dismiss them as endorsed by unqualified 'outliers' from the scientific community. Consequently, even though these open letters and other documents are signed by some of the absolute leaders in the world in understanding the causes of climate change, the majority of the public knows little about these lists, freeing government to proceed as if they didn't even exist.
So, the next time someone tells you that only a few unqualified scientists in unrelated fields disagree with the politically-correct view on the causes and consequences of climate change, send them the above list and ask, "Really? How about these?"
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