Top U.S. Scientists, Economists Urge Carbon Cuts

"We call on our nation's leaders to swiftly establish and implement policies to bring about deep reductions in heat-trapping emissions," said the letter, whose 1700 signers included six Nobel Prize winners and 31 members of the National Academy of Sciences. "The strength of the science on climate change compels us to warn the nation about the growing risk of irreversible consequences as global average temperatures continue to increase."

link

And let the debate begin:

Critics of mandatory action on climate change are sure to oppose the letter, but some scientists declined to sign it because it wasn't tough enough. Those include NASA's James Hansen, who, among other measures, wants an immediate ban on coal plants that do not capture and sequester their carbon dioxide.