The warnings of global warming are high and getting higher. A senior NASA scientist warned this month that the world may be within a decade of tipping into weather patterns it has not seen in half a million years.

Last week in Montreal, with more than 150 nations gathered to discuss next steps on global warming, Canadian Prime Minister Paul Matin nearly begged the United States to join a global effort.

Despite the fact the US remains the world’s biggest greenhouse-gas emitter, the Bush Administration has refused to be part of a unified response. For better or worse, it did not sign the Kyoto Protocol and even temporarily walked out of the Montreal conference.

Hear about world response to global warming after Montreal, and American resistance to a global plan.

Guests:

Peter Spotts, Science Correspondent for the Christian Science Monitor

Eileen Claussen, President of the Pew Center on Global Climate Change and Strategies for the Global Environment – formerly Assistant Secretary of State for Oceans and International Environmental and Scientific Affairs in the Clinton Administration.