The IPCC models have not managed to identify an underlying base line on which to add or subtract potential human impacts on climate, and ALL of the models have predicted significantly greater warming than has actually occurred.
Well, in the past few months, researchers in THREE SEPARATE COUNTRIES, Japan, Finland, and Australia, have all published material claiming to have found the "missing link" that explains climate change. AND, all three conclude that man-made climate change (that is, climate change induced by carbon dioxide) is virtually non-existent, eclipsed by the heating and cooling effects of cloud formation due to increased cosmic radiation. (It's the SUN stupid).
It will be interesting to see whether peer reviews of the material produce agreement with the conclusions.
Here are some easy to read links:
Here's a copy of the Finnish Research Paper:
Here's a copy of the Japanese Paper: