My faith in the validity of the IPCC tanked after going through Climategate II emails. It spoke of how the IPCC was rushing to publish non-peer reviewed studies in their public releases to "prove" climate change and how the IPCC was fighting people to make claims to the public that scientists doing the papers said were not viable based on their data. Also, the IPCC has been sitting on data that contradicts their thesis. 

Totally untrustworthy and the IPCC is the largest source of this "climate change" data.