A group of scientists have challenged the IPCC to admit that there is no evidence that human activity drives climate change. Specifically, they sent a letter this month to the Chairman of the UN’s Intergovernmental Panel on Climate Change asking those associated with the panel to:\n\n\nretract support from the current IPCC position and admit that there is no observational evidence in measured data going back 22,000 years or even millions of years that CO2 levels (whether from man or nature) have driven or are driving world temperatures or climate change.\n\n\nAnd they issue this challenge: “If you believe there is evidence of the CO2 driver theory in the available data please present a graph of it.”\nThe letter is signed by Hans Schreuder (Analytical Chemist), Piers Corbyn (Astrophysicist ), Dr Don Parkes (Prof. Human Ecology (Ret)), and Svend Hendriksen (1988 Nobel Laureate), and a copy is available at a website operated by the International Climate Science Association. (here)\nEvidence presented in the letter goes well beyond putting the “hockey stick” graph, made famous in Al Gore’s movie, in doubt. The hockey stick presented exponentially increasing global temperature in the near future due to uncontrolled increases in CO2 – and got its name from the shape of the graph – an apparently long stable period with an upward increase in CO2 and temperature during the industrial age. The UN panel claimed that human activity was driving what Mr. Gore explained as a certain end to civilization as we know it, if extreme political and economic measures are not taken.\nThe scientists assembled a graph based on actual measurements and did not find evidence that CO2 was the main driving force behind temperature. In fact, temperature increases and decreases, showing little interest in CO2 level.\nGraph below shows CO2 (green line) continues upwards while temperature (the other two lines) fluctuates, dropping recently; offering compelling evidence against the belief that CO2 drives global temperature.\nThe letter goes on to provide an urgent reason for renouncing the UN panel report.\n\n\nIPCC policy is already leading to economic and unintended environmental damage. Specifically the policy of burning food “ maize as biofuel “ has contributed to sharp rises in food prices which are causing great hardship in many countries and is also now leading to increased deforestation in Brazil, Malaysia, Indonesia, Togo, Cambodia, Nigeria, Burundi, Sri Lanka, Benin and Uganda for cultivation of crops.\nGiven the economic devastation that is already happening and which is now widely recognised will continue to flow from this policy, what possible justification can there be for its retention?\n\n\nThe position taken by the scientists is not out of the ordinary from the steady stream of data, analysis and commentary from the scientific community. So too have economists and others challenged the global warming political agenda, which calls for unprecedented levels of taxation and government control based on the scariest projections of bad science. Nonetheless, the IPCC report provides a basis for international agreements such as the “Kyoto Protocol” agreement, which is an international start on the agenda. Both Democratic Party presidential candidates, as well as John McCain have spoken in favor of global warming related reform.