This link takes you to the "Solving Global Warming" section of the David Suzuki Foundation's web site. From there, you can link to the Intergovernmental Panel on Climate Change (IPCC) report, which is largely responsible for the latest round of media coverage we are in. Other links are organized by topic: Science, Impact, Kyoto Protocol, Energy, Solutions, What You Can Do, Publications, and of course, more Links.
The IPCC report can also be accessed directly at http://www.ipcc.ch/.
you arrive directly at the debate about carbon offsets, including links to organizations with differing opinions.