Recently, the National Development and Reform Commission and the Ministry of Foreign Affairs jointly sent a thank-you letter to Tsinghua University. They thanked the researchers at Tsinghua University School of Environment, Department of Earth System Science and Nuclear Research Institute for their work at the UN Climate Change Bonn Conference. Wang Can, a two-hired professor in the Department of Earth System Science and Cai Wenjia, associate professor in the Department of Earth System Science, was honored as a member of Tsinghua University in this negotiation delegation.

The United Nations Climate Change Bonn Conference was successfully held in Bonn, Germany, from November 6 to 18, 2017. The meeting reached a number of achievements and formed the basis for the follow-up negotiations on the implementation of the Paris Agreement. The meeting defined the program for facilitating dialogue and organization in 2018 and made arrangements to accelerate the implementation of commitments and actions by 2020. The Bonn Conference assumed the negotiation of the technology-related issues. Wang Can and Cai Wenjia acted as coordinators of the "G77 + China" on the technical issue and played an important role in coordinating the stance of developing countries and safeguarding the solidarity and overall interests of developing countries.

Wang Can and Cai Wenjia have long been engaged in energy-environment-economy system simulation and analysis, and mitigation of impact assessment of technologies and policies on sustainable development. In recent years, many achievements have been made in modeling the multidimensional impact of low-carbon transition in energy systems, technology optimization and roadmap for low-carbon development, and they have provided powerful scientific support for climate negotiations.