"WASHINGTON -- Top scientists from a variety of fields say they are about as certain that global warming is a real, man-made threat as they are that cigarettes kill."

"They are as sure about climate change as they are about the age of the universe. They say they are more certain about climate change than they are that vitamins make you healthy or that dioxin in Superfund sites is dangerous.

They'll even put a number on how certain they are about climate change. But that number isn't 100 percent. It's 95 percent.

And for some non-scientists, that's just not good enough."

Seth Borenstein reports for the Associated Press September 24, 2013. [2]