"As many as a third of the species known to science may be at risk of extinction if average temperatures rise by more than 1.5 degrees Celsius."

Redding.com: Blogs: Doug Craig's blog

In November of 2007, Scientific American published an article it called "State of the Science: Beyond the Worst Case Climate Change Scenario."

It was based on the Synthesis Report published by the Intergovernmental Panel on Climate Change (IPCC).

The Scientific American article summarized the IPCC report so its readers could more readily grasp what the world's climate scientists and representatives from every nation on Earth, including the United States was warning them was coming.
...
"Continued global warming is virtually certain (or more than 99 percent likely to occur)."
...
"As many as a third of the species known to science may be at risk of extinction if average temperatures rise by more than 1.5 degrees Celsius."