The main issue in the global warming debate is the truth. The only question in this debate is “does human emission of CO2 causes global warming?” One way to answer this question is to compare the IPCC projections for the mean global temperature anomaly with actual measurements as shown in the above chart.
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The above result shows that the IPCC projection is incorrect. Actually, the observed (hadcrut3) mean global temperatures are even less than the projections with emission commitment held constant at year 2000 values, as shown by the orange curve in the above chart.
It is crucial that public policy be based on facts. CO2 driven global warming is not supported by the data.
Girma Orssengo, MASc, PhD
References:
[1] IPCC 2007 WG1-AR4
[2] Hadley Centre Mean Global Temperature Observed Data:
http://www.woodfortrees.org/data/hadcrut3vgl/compress:12
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