From Island Press:
In the past year, the IPCC released a new global consensus statement called Climate Change 2007. This consensus establishes without doubt that global warming is being caused by humans, and that its magnitude and impacts are greater than we thought just a few years ago.
The IPCC recently released a short summary of that report. That summary, prepared for policymakers, is nonetheless a challenging read for all but specialists. Yet the information it contains is far too important to be understood only by a select few.
See free download on "What the IPCC Said" and a link to IPCC 4th Assessment Synthesis Report.