Your link mentions “Summaries for Policymakers”, which is not the scientific report.
Here's a list of Contributors to the IPCC WGI Fourth Assessment Report. (Need to scroll down to page 14 of the PDF file). Show me the "social scientists -- or just policy experts and government functionaries." in that list.

Redirecting the focus from the scientific assessment to “Summaries for Policymakers” is a tactic that the AGW deniers use to make the debate political instead of scientific.

__________________
If electricity comes from electrons, does morality come from morons?