it's politicized in the other direction. the ipcc reports have to be approved by all the member countries, many of whom (like the good 'le USofA) really don't want to take action on climate change. this results in IPCC reports that are watered down. for example:
> Political influence on the IPCC has been documented by the release of a memo by ExxonMobil to the Bush administration, and its effects on the IPCC's leadership. The memo led to strong Bush administration lobbying, evidently at the behest of ExxonMobil, to oust Robert Watson, a climate scientist, from the IPCC chairmanship, and to have him replaced by Pachauri, who was seen at the time as more mild-mannered and industry-friendly.[142][143]