That is an excellent article. The scientific IPCC document that article is referring to can be found here:

http://www.ipcc.ch/SPM2feb07.pdf

This is just a summary article though. Each of the sections will be expanded upon and a full release of the report will be happening later this year. In the scientific world, the IPCC report is taken almost as gospel. Over 600 leading researchers in countries worldwide work on the IPCC report and it's edited by several hundred others for accuracy. The organization releases a climate report only every 5 years, so it's a big deal when a new one comes out.