Copenhagen Climate Challenge

Copenhagen Climate Challenge

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UPDATE (June 13, 2012): 

UN Secretary General Ban Ki-moon has yet to acknowledge receipt of either the 2007 Bali open letter, or the 2009 Copenhagen Climate Challenge (a postal trace (see here) was done on the latter after it was sent a second time and it was confirmed that Secretary General Moon did indeed receive the open letter).

History will record that UN Secretary General Ban Ki-moon boosted the climate scare, totally ignoring the repeated advice of leading scientists that it was wrong.


ICSC Executive Director Tom Harris announced the Copenhagen Climate Challenge in a special two-day counter-conference held in Copenhagen a few kilometers from the main UNFCCC site. The following video shows his presentation of the Challenge:

From the desk of Tom Harris, Executive Director, International Climate Science Coalition, Ottawa, Canada 
e-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it
Phone in Canada: 613-728-9200


Open Letter to UN Secretary-General


His Excellency Ban Ki Moon
Secretary-General, United Nations
New York, NY
United States of America
December 8, 2009


Dear Secretary-General,

Climate change science is in a period of ‘negative discovery’ - the more we learn about this exceptionally complex and rapidly evolving field the more we realize how little we know. Truly, the science is NOT settled.

Therefore, there is no sound reason to impose expensive and restrictive public policy decisions on the peoples of the Earth without first providing convincing evidence that human activities are causing dangerous climate change beyond that resulting from natural causes. Before any precipitate action is taken, we must have solid observational data demonstrating that recent changes in climate differ substantially from changes observed in the past and are well in excess of normal variations caused by solar cycles, ocean currents, changes in the Earth's orbital parameters and other natural phenomena.

We the undersigned, being qualified in climate-related scientific disciplines, challenge the UNFCCC and supporters of the United Nations Climate Change Conference to produce convincing OBSERVATIONAL EVIDENCE for their claims of dangerous human-caused global warming and other changes in climate. Projections of possible future scenarios from unproven computer models of climate are not acceptable substitutes for real world data obtained through unbiased and rigorous scientific investigation.

Specifically, we challenge supporters of the hypothesis of dangerous human-caused climate change to demonstrate that:

  1. Variations in global climate in the last hundred years are significantly outside the natural range experienced in previous centuries;
  2. Humanity’s emissions of carbon dioxide and other ‘greenhouse gases’ (GHG) are having a dangerous impact on global climate;
  3. Computer-based models can meaningfully replicate the impact of all of the natural factors that may significantly influence climate;
  4. Sea levels are rising dangerously at a rate that has accelerated with increasing human GHG emissions, thereby threatening small islands and coastal communities;
  5. The incidence of malaria is increasing due to recent climate changes;
  6. Human society and natural ecosystems cannot adapt to foreseeable climate change as they have done in the past;
  7. Worldwide glacier retreat, and sea ice melting in Polar Regions , is unusual and related to increases in human GHG emissions;
  8. Polar bears and other Arctic and Antarctic wildlife are unable to adapt to anticipated local climate change effects, independent of the causes of those changes;
  9. Hurricanes, other tropical cyclones and associated extreme weather events are increasing in severity and frequency;
  10. Data recorded by ground-based stations are a reliable indicator of surface temperature trends.


It is not the responsibility of ‘climate realist’ scientists to prove that dangerous human-caused climate change is not happening. Rather, it is those who propose that it is, and promote the allocation of massive investments to solve the supposed ‘problem’, who have the obligation to convincingly demonstrate that recent climate change is not of mostly natural origin and, if we do nothing, catastrophic change will ensue. To date, this they have utterly failed to do.

Signed by:


Science and Technology Experts Well Qualified in Climate Science


Science and Technology Experts in Other Related Disciplines - this is only the beginning of the list that is being created based on the feedback from many supportive highly qualified scientists and engineers who are not specifically climate experts

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