CBS: Top scientists from a variety of fields say they're about as certain that global warming is a real, man-made threat as they are that cigarettes kill.
They're as sure about climate change as they are about the age of the universe. They say they're 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: it's 95 percent.
One climate scientist involved...