The American West is heating faster than any other region of the country and faster than the Earth as a whole, according to an analysis of 50 scientific studies.

Between 2003 and 2007, the global climate averaged 1 degree Fahrenheit warmer than its 20th-century average. During the same period, 11 Western states averaged 1.7 degrees warmer — 70% more than the world as a whole, the analysis reported.

The 54-page study, “Hotter and Drier: The West’s Changed Climate,” was released yesterday by the Rocky Mountain Climate Organization — a coalition of local governments, businesses, and nonprofits — and the Natural Resources Defense Council.

The report says “the growing consensus among scientists who study the West that climate change is no longer an abstraction,” according to the director of Western Water Assessment at the University of Colorado, Brad Udall. “The signs are everywhere.”

Data suggest, Mr. Udall noted, that as time goes on, the West will warm about 1 1/2 times faster than the global average. That is because large, arid areas away from slow-warming oceans will heat more than other areas.

The Colorado River basin, which spans the Western region between Wyoming and Mexico, is in the throes of drought, and climate scientists predict that the additional warming will accelerate the melting of snow-packs that feed the river, causing more severe droughts. About 30 million people in such urban areas as Los Angeles, San Diego, Phoenix, and Las Vegas depend on water from the Colorado and its tributaries.

The federal Environmental Protection Agency is under court orders to address global warming, and Congress is considering legislation to curb greenhouse gases, which scientists say are largely responsible for the heating of the planet. Utilities that operate coal-fired power plants and other industries are battling the legislation, which is expected to be debated in the Senate this spring.