CHAI Qimin, professor and director for strategy and planning in National Center for Climate Change Strategy and International Cooperation (NCSC), deputy director of Research Center for Green Finance and Sustainable Development in University of International Business and Economics, guesting professor of Research Center for Contemporary Management in Tsinghua University and Guizhou Institute of Technology, vice-chair of the Technical Expert Group on Environment and Development under the United Nations Economic and Social Commission for Asia and the Pacific (ESCAP), vice-chair and secretary-general of the Committee on Carbon Peaking and Carbon Neutrality, vice-chair of the Committee on Synergistic Governance of Pollution and Carbon Reduction in Chinese Society of Environmental Sciences, deputy secretary-general of the Committee on Energy System Engineering in Chinese Energy Research Society, senior fellow of Global Climate Strategy Committee and China Carbon Neutral 50 Forum. His professional activities and publications focus on global climate governance, new energy policy, green finance and investment, sustainable infrastructure, climate change economics and integrated assessment. He currently serves as the delegate of Chinese Delegation to UN Climate Negotiations, the advisor for government and market on green development, and he was deeply involved in drafting the Mid-century Long-term Greenhouse Gas Low Emission Development Strategy (Carbon Neutrality 2060), National Carbon Emission Peak Action Plan, Nationally Determined Contribution (NDCs), Five-year Planning, Green Belt and Road Initiative, energy and green finance policy. He was engaged as the leader or chief scientist of over 60 national and provincial research projects, and have won the Excellent Research Achievement Awards of Ministry of Ecology and Environment, National Development and Reform Commission, National Energy Administration, etc.He was once primarily in charge of the modeling development such as Integrated Assessment Model for Global Change (IAMC), Low Carbon Energy and Economy Model (LCEM), Belt and Road Integrated Assessment Model (BRIAM) since 2005. He was formerly the faculty in Institute of Energy, Environment and Economy, co-director of Tsinghua-MIT Program on Energy and Climate Change Modeling, and the fellow of Institute of Nuclear and New Energy Technology, China Automotive Energy Research Center and the Laboratory of Low Carbon Energy, Tsinghua University. He once worked in the Precourt Institute for Energy at Stanford University, and the Joint Global Change Research Institute of Pacific Northwest National Laboratory and the University of Maryland.