David Evans of Science Speak comments:

“Our scientific understanding of global warming has gone through three stages:

1. 1985 – 2003. Old ice core data led us strongly suspect that CO2 causes global warming.
2. 2003 – 2007. New ice core data eliminated previous reason for suspecting CO2. No evidence to suspect or exonerate CO2.
3. From Aug 2007: Know for sure that greenhouse is not causing global warming. CO2 no longer a suspect.”

Read more from IceCap. There’s a PDF listed as well documenting the findings. Interesting food for thought.