Nathan Hultman

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Professor; Director, CGS
Affiliations:
Curriculum Vitae

Nate Hultman joins the U.S. State Department as Distinguished Senior Advisor for Climate Ambition, a six-month role that will conclude in January 2025. Ryna Cui serves as acting director of the Center for Global Sustainability in the interim. 

Nate Hultman is the founder and director of the Center for Global Sustainability at the University of Maryland, and professor in the School of Public Policy. He is currently on leave from the University of Maryland, serving as distinguished senior advisor for climate ambition in the Office of the Special Presidential Envoy for Climate at the U.S. Department of State. Hultman’s work focuses on developing, setting and achieving ambitious national climate goals, including nationally determined contributions under the Paris Agreement. This work includes U.S. climate policy, rapid coal phaseout strategies in diverse national contexts and economy-wide emissions reduction strategies in major economies, including in the United States, China and others. 

Previously, from 2021–22, Hultman served as senior advisor for the Special Presidential Envoy for Climate at the U.S. Department of State, where he led the writing of the 2021 U.S. Long-Term Strategy and helped negotiate the U.S.-China Joint Glasgow Declaration at COP26. He has led or contributed to several recent assessments of U.S. national climate strategies and emissions targets. In the Obama White House, he helped develop the 2025 U.S. NDC and participated in the Lima and Paris climate negotiations. 

When not in government, Hultman has participated in the UN climate negotiations as a non-governmental observer for over 25 years, starting with the Kyoto meeting. Hultman has also been a nonresident senior fellow at the Brookings Institution in Washington, DC. He holds a B.A. in Physics from Carleton College and a Ph.D. in Energy & Resources from the University of California, Berkeley.

Areas of Interest
  • Climate change; energy policy; US federal climate policy
U.S. Program

After the U.S. withdrew from the Paris Agreement in 2017, CGS led the analysis of commitments from the more than 4,000 cities, states, businesses, universities, communities of faith, and more who pledged to support the goals of the Paris Agreement in their own capacity. Since the U.S. officially rejoined the Paris Agreement in March 2021, CGS has continued working with U.S. subnational and international partners to deliver analysis that informs how an "all-of-society" ambitious and achievable U.S. climate strategy can drive actionable and feasible policy. CGS informs U.S. climate policy from the local to global through developing integrated modeling and climate scenarios for the federal government, advising on international discussions to ramp up ambition, and collaborating from the bottom-up to move the resources necessary to set and achieve ambitious climate goals.

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Subnational Climate Ambition Program

Rising to meet the ambition set out by our global climate commitments demands accelerated actions and commitments between all actors across our society: states, cities, businesses, universities, faith groups, and more. These sum-of-society actors have incredible leverage to impact the trajectory of greenhouse gas emissions, innovate across our economy, and accelerate the speed of the global clean energy transition.

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National Climate Strategies

Successfully addressing the climate crisis while achieving sustainable development goals will require carefully constructed strategies to enact rapid economic transitions to a cleaner economy—tailored to national circumstances and priorities. The Center for Global Sustainability has deep expertise in country-specific analytical and policy approaches across key sectors and in support of a 1.5°C-pathway.

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View All Publications
Feasibility of peak temperature targets in light of institutional constraints

School Authors: Christoph Bertram, Yiyun 'Ryna' Cui, Nathan Hultman, Gokul Iyer

Other Authors: Elina Brutschin, Laurent Drouet , Gunnar Luderer , Bas van Ruijven, Lara Aleluia Reis , Luiz Bernardo Baptista, Harmen-Sytze de Boer, Vassilis Daioglou, Florian Fosse , Dimitris Fragkiadakis 8 , Oliver Fricko, Shinichiro Fujimori , Kimon Keramidas, Volker Krey, Elmar Kriegler, Robin D Lamboll, Rahel Mandaroux , Pedro Rochedo, Joeri Rogelj, Roberto Schaeffer, Diego Silva, Isabela Tagomori, Detlef van Vuuren, Zoi Vrontisi, Keywan Riahi