NEW YORK // Bold initiatives against global warming have come out of major cities around in the world over the past few weeks - with the notable exception of Washington.

Meeting in New York this month, dozens of big-city mayors from six continents competed to present the most ambitious plan for reducing emissions of carbon dioxide and other gases that cause global warming.

New York Mayor Michael Bloomberg presented his 127-point plan to cut Gotham's emissions 30 percent by 2030. Los Angeles Mayor Antonio Villaraigosa committed to reducing his city's carbon emissions 35 percent by 2030. Toronto's David Miller has signed up his city for Zerofootprint, a carbon calculator and social networking Web site that helps individuals reduce greenhouse gas production, to help Canada's largest city meet its goal of reducing greenhouse gas emissions by 6 percent in five years and 80 percent by mid-century.

In Washington, meanwhile, legislation that would set similar goals for the United States is inching through Congress as the White House resists calls for greenhouse gas reduction targets.

Spurred by a recent Supreme Court ruling, President Bush did sign an executive order May 14 asking federal agencies to develop regulations to "cut gasoline consumption and greenhouse gas emissions from motor vehicles" by the end of next year.

But on Tuesday, Attorney General Jerry Brown of California urged the U.S. Environmental Protection Agency to grant a waiver that would allow his state and at least 11 others to act sooner. The states want to enact rules requiring automakers to cut emissions from cars and light trucks by 25 percent, and from sport utility vehicles by 18 percent, starting with the 2009 model year.

"This is more important than any issue that EPA's going to have to face," Brown said.

California Gov. Arnold Schwarzenegger has said he will sue the agency if it fails to act by Oct. 25.

Internationally, the White House is trying to avoid action against global warming. At preliminary negotiations in Bonn this month, administration officials reportedly said they would refuse to discuss a follow-on agreement to the Kyoto Protocol when the treaty's signatories meet in Bali later this year. The protocol, which expires in 2012, sets carbon reduction goals for industrialized nations. It was signed by the Clinton administration but never submitted to Congress for ratification.

U.S. officials are also resisting German Chancellor Angela Merkel's wish to include carbon reductions on the agenda of next month's G-8 summit. Japanese Prime Minister Shinzo Abe said last week he would push the proposal during the summit. But such a measure is seen as increasingly unlikely to succeed, mostly thanks to U.S. opposition.

New Department of Energy statistics show that U.S. carbon emissions actually fell slightly last year, mostly thanks to mild weather and high energy prices. But the long-term emissions trend is still up - 17.9 percent since 1990.

And a study by NASA scientist James Hansen, whose 1988 congressional testimony on global warming is now remembered as a watershed by environmentalists, concluded that summer temperatures in Washington and other Eastern cities could rise as much as 10 degrees Fahrenheit by 2080 if nothing is done to curb greenhouse gas emissions.

It is such warnings, coupled with Washington's reluctance, that have led local and regional officials to act. At this month's conference of mayors in New York 16 major cities signed up for a deal brokered by former President Bill Clinton that lets them borrow money for energy conservation retrofits of municipal buildings, then repay the loans with the resulting cost savings.

"Unfortunately, it has fallen to the mayors to do it because at the federal level in this country and other countries, they seem to be tied up," Bloomberg said.

One of those local leaders is Washington Mayor Adrian M. Fenty, who recently committed his constituents to the goal of reducing carbon dioxide emissions below 1990 levels in the next five years by signing the U.S. Conference of Mayors Climate Protection Agreement.