The Environment in 2008

Last week's Nobel Prize for Al Gore on climate change has lit up the issue again globally, including on the American campaign trail in the '08 race for the White House.

As in no other election cycle in American history, candidates are being aggressively buttonholed on what they would do about global warming. The range of responses is large between Republicans and Democrats, and significant even among the latter.

The most aggressive would mean gigantic emission cuts by the middle of this century. Would they be enough?

This hour, On Point: climate change and the '08 presidential campaign.Guests:

Juliet Eilperin, national environmental reporter for the Washington Post.

Cathy Duvall, national political director for the Sierra Club.

Ted Nordhaus, co-author of "Break Through: The Death of Environmentalism and the Politics of Possibility."

James L. McCarthy, shared the Nobel Peace Prize win with other IPCC scientists, Professor of Biological Oceanography at Harvard University.