President Clinton says global warming is a major threat to humanity. But he's coming under fire from diplomats abroad and from senators in his own party who say the President is not doing enough to offset climate change. Next month, diplomats meet in Bonn, Germany to continue negotiations over the reduction of greenhouse gases reached last fall in Kyoto, Japan. The Kyoto agreement set binding limits for industrialized nations, but left blank some of the details of implementation. Those details will be on the table in Bonn, and many diplomats say they'd like to see them worked out so that a major meeting planned for the fall in Buenos Aires can finish the job. Steve Curwood spoke with Senator John Kerry, a Democrat from Massachusetts, who says that won't happen unless the Clinton Administration steps up its efforts to sell the treaty abroad and at home.