– Scientific Evidence Rejects Anthropogenic CO2 Theory
This document provides a brief summary of the CO2 global warming issue – and shows why the theory is wrong.
The Phenomenon
Global Temperatures have generally increased over the last century (except for the last 10 years) – as has the atmospheric CO2. The United Nations based Intergovernmental Panel on Climate Change (IPCC) has become the definitive authority on the promotion of the anthropogenic CO2 as the cause of the warming and of the justification of scare stories of what the future may bring.
The following shows the Hadley Climatic Research Unit global average temperature anomalies (the IPCC uses data provided by HadCRU – plot from: [http://hadobs.metoffice.com/hadcrut3/diagnostics/global/nh+sh/]). The global average temperature has increased about 0.8 degrees C in the last 100 years.
The Evidence
There is no empirical evidence that anthropogenic CO2 has caused the observed global warming trend – the only evidence comes from the in the computerized climate models based on the assumptions incorporated in the models.
The following figure superimposes the above HadCRU temperature anomalies on the IPCC graph of model outputs. (IPCC 2007 AR4 Figure SPM-4 [http://www.ipcc.ch/pdf/assessment-report/ar4/syr/ar4_syr_spm.pdf]) In this figure, the blue shaded bands show the result of 19 simulations from 5 climate models using only the natural forcings. Red shaded bands show the result of 58 simulations from 14 climate models including anthropogenic CO2. This clearly shows that prior to about 1972, the global warming is fully explained by climate models using only natural forcings (i.e. no human CO2). The models need input of CO2 only after about 1970 – prior to 1970 all warming was natural, according to the IPCC. There is no empirical evidence relating CO2 to the post-1970 warming as a causative factor – only the fact that the computer models require CO2 to produce warming.
The media stories often report temperature increases over the last century and attribute it to anthropogenic (human caused) CO2 based global warming – but the models indicate that anthropogenic CO2 has only caused warming since the early 1970s. Even though the IPCC released this figure in 2007, it only shows temperatures up to the year 2000 – likely due to the fact that there has been cooling since then (although atmospheric CO2 has continued to increase).
This fact is also revealed in the CRU emails released in November 2009:
Email exchange between: Michael Mann, Edward Cook and Tom Crowley, May 2, 2001, (Subject: “Hockey Stick” [http://www.eastangliaemails.com/emails.php?eid=172&filename=963233839.txt]).
Cook to Mann: “I think that most researchers in global change research would agree that
the emergence of a clear greenhouse forcing signal has really only occurred
since after 1970. I am not debating this point, although I do think that
there still exists a signficant uncertainty as to the relative
contributions of natural and greenhouse forcing to warming during the past
20-30 years at least.”
Read more:
http://www.appinsys.com/GlobalWarming/GW_Summary.htm
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