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DENVER — Michael Hancock added his name to a growing list of mayors across the country working to strengthen efforts against climate change.

The Denver mayor posted pictures on Twitter on Saturday after signing the Climate Mayors Letter, committing the city to meeting the goals of the Paris climate agreement.

The renewed efforts to slow climate change are a direct reaction to the Trump administration’s decision to withdraw the U.S. from the sweeping agreement that includes nearly every country.

The mayors published an open letter earlier this month.

“If the president wants to break the promises made to our allies enshrined in the historic Paris agreement, we’ll build and strengthen relationships around the world to protect the planet from devastating climate risks,” according to the letter.

In Colorado, the mayors of Aspen, Denver, Lakewood, Longmont and Boulder have pledged to uphold the agreement.

Mayors from across America will gather in Chicago in the fall to discuss climate change, and advance new programs and initiatives.