WASHINGTON, D.C. – October 30, 2025 – Today, America Is All In, Climate Mayors, and the U.S. Climate Alliance announced that a U.S. delegation of more than 100 local leaders will participate in the U.N. Climate Change Conference (COP30), the COP30 Local Leaders Forum, and the C40 World Mayors Summit in November. The delegation, which includes U.S. governors, mayors, and other top city and state officials, will be led by U.S. Climate Alliance Co-Chair Wisconsin Governor Tony Evers, New Mexico Governor Michelle Lujan Grisham, America Is All In Managing Co-Chair Gina McCarthy, and Climate Mayors Chair and C40 Cities Vice Chair Phoenix Mayor Kate Gallego. Participating U.S. leaders will reinforce their commitment to the Paris Agreement’s goals and share local climate solutions that are lowering energy costs, growing jobs, and cutting dangerous pollution in America.
“The Alliance’s states and territories have long been laboratories and launchpads for the world’s most innovative and impactful climate solutions. Here in Wisconsin and across the country, we’re delivering cleaner air and energy – and a more sustainable future for our kids and grandkids,” said U.S. Climate Alliance Co-Chair and Wisconsin Governor Tony Evers. “The Alliance looks forward to catalyzing even deeper partnership and action in Brazil, where we’ll make sure the world knows that no matter the obstacles, we’re charging forward.”
“When the federal government fails to act in our country’s best interest, America Is All In is stepping up to organize U.S. leaders who are ready, willing and able to come to Brazil in force. We are determined to deliver on the promises we made to the American people and our international partners” said Gina McCarthy, America Is All In Managing Co-Chair, 13th U.S. EPA Administrator, and first White House National Climate Advisor.
“American cities have always been at the forefront of innovation and climate action, and mayors across the country are doubling down to fill the current void of leadership at the federal level,” said Phoenix Mayor Kate Gallego, Chair of Climate Mayors and C40 Cities Vice Chair, “We’re driving pragmatic solutions that deliver immediate benefits to residents — lowering energy bills, protecting access to clean water and energy, and ensuring our neighborhoods are safe from extreme weather. America Is All In demonstrates the power of our collective action and acting on the belief in a better future.”
In total, governors, more than a dozen senior officials from six U.S. Climate Alliance states, and more than 35 mayors and 50 city officials from 26 states will participate in the Local Leaders Forum and COP30 in Brazil. These leaders will join a number of events, hosted by America Is All In, Climate Mayors, and the U.S. Climate Alliance, at the COP30 Local Leaders Forum and the C40 World Mayors Summit in Rio de Janeiro. America Is All In will also host local leaders at the We Mean Business Pavilion in Belem. Events include:
America Is All In also announced that Todd Stern, Trigg Talley, and Genevieve Maricle – three of America’s most experienced international climate policy leaders – will join the delegation of U.S. leaders. In Brazil, they will provide support and guidance to state and local leaders as they deepen their engagement and climate cooperation with international counterparts, civil society, and private-sector partners. Stern, America Is All In’s High-Level Champion for Climate, served as the U.S. State Department Special Envoy for Climate Change at COP21 when the Paris Agreement was adopted. Talley, America Is All In’s Special Representative, served as the U.S. State Department across multiple administrations including as Deputy Special Envoy for Climate Change. Maricle, America Is All In’s Special Advisor, brings climate experience from the U.S. Mission to the United Nations and the White House National Security Council, where she served as the Director of Climate Policy.
Today’s announcement comes one week after a delegation of top officials representing the U.S. Climate Alliance, Climate Mayors, C40 Cities, and America is All In met with COP30 President Ambassador André Corrêa do Lago and COP30 Executive Director Ana Toni. In that meeting, U.S. leaders emphasized their continued commitment to global climate cooperation and showcased recent climate progress at home.
Additional high-level local leaders are expected to confirm their participation in the days ahead.
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About America Is All In
America Is All In is the most expansive coalition of leaders ever assembled in support of climate action in the United States. Mobilizing thousands of U.S. cities, states, tribal nations, businesses, schools, and faith, health, and cultural institutions, the coalition is focused on developing and delivering an ambitious, all-in national climate strategy that meets the urgency of the climate crisis; scaling climate action around the country to accelerate the transition to a 100 percent clean energy economy; and promoting the leadership of non-federal actors on the world stage. America Is All In champions a whole-of-society mobilization to deliver the transformational change that science demands, with the goal of a healthy, prosperous, equitable, and sustainable future. To learn more or get involved, visit www.americaisallin.com and follow us on X, LinkedIn, Instagram, and Bluesky.
About the U.S. Climate Alliance
Launched in 2017 by the governors of Washington, New York, and California to help fill the void left by the U.S. federal government’s withdrawal from the Paris Agreement, the Alliance has grown to include 24 governors from across the U.S. representing approximately 60 percent of the U.S. economy and 55 percent of the U.S. population. The Alliance’s states and territories continue to advance innovative and impactful climate solutions to grow the economy, create jobs, and protect public health, and have a long record of action and results. In fact, the latest data shows that as of 2023, the Alliance has reduced its collective net greenhouse gas emissions by 24 percent below 2005 levels, while increasing collective GDP by 34 percent, and is on track to meet its near-term climate goal of reducing collective greenhouse gas emissions 26 percent below 2005 levels by 2025. Follow the Alliance at www.usclimatealliance.org and on X, LinkedIn, Instagram, and Bluesky.
About Climate Mayors
Climate Mayors is a bipartisan network of nearly 350 mayors, demonstrating climate leadership through meaningful actions in their communities since 2014. Representing 46 states and nearly 60 million Americans, Climate Mayors reflects U.S. cities’ commitment to climate progress. For more information, visit our website and follow Climate Mayors on X, Bluesky, and LinkedIn. Media Contact: climatemayors@fgsglobal.com
Launched in 2017 by the governors of Washington, New York, and California to help fill the void left by the U.S. federal government’s withdrawal from the Paris Agreement, the Alliance has grown to include 24 governors from across the U.S. representing approximately 60 percent of the U.S. economy and 55 percent of the U.S. population. Governors in the Alliance have pledged to collectively reduce net greenhouse gas emissions by at least 26-28 percent by 2025, 50-52 percent by 2030, and 61-66 percent by 2035, all below 2005 levels, and collectively achieve overall net-zero greenhouse gas emissions as soon as practicable, and no later than 2050.
The Alliance’s states and territories continue to advance innovative and impactful climate solutions to grow the economy, create jobs, and protect public health, and have a long record of action and results. In fact, the latest data shows that as of 2023, the Alliance has reduced its collective net greenhouse gas emissions by 24 percent below 2005 levels, while increasing collective GDP by 34 percent, and is on track to meet its near-term climate goal of reducing collective greenhouse gas emissions 26 percent below 2005 levels by 2025.
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