Hundreds of U.S. cities are taking a stand against global warming by pledging to reduce greenhouse-gas emissions beyond what the federal government is willing to commit.

From metropolitan hubs like New York and Los Angeles to fast-growing cities such as Las Vegas, more than 450 city leaders throughout the 50 states have signed the U.S. Mayors Climate Protection Agreement.

Buckeye, Flagstaff and Tucson are the only Arizona cities to sign the agreement.

Arizona Republic