The only question in the climate debate is “does human emission of CO2 causes global warming?” One way to answer this question is to compare IPCC’s model projections for the global mean temperature with actual observations (hadcrut3 data) as shown in the above chart.
The above result shows IPCC projections are wrong. Actually, the observed global mean temperatures are even less than the projections if emission were held constant at year 2000 level, as shown by the orange curve in the above chart.
It is extremely crucial that public policy be based on facts. The above data shows, human emission of CO2 does not cause global warming.
 IPCC 2007 WG1-AR4
 Global Mean Temperature Observed Data from Hadley Center:http://bit.ly/A8aXBm