Cooperation between China, Europe and the U.S. will be vital to winning the global fight against climate change – that was the main takeaway from a panel of experts on Thursday who discussed how the three can work together, despite their differences over things like trade, politics and security. The trio are among the world's top emitters of greenhouse gases. In 2019, China accounted for 27 percent of global greenhouse gas emissions, more than all developed nations combined, according to the Rhodium Group. The U.S. accounted for 11 percent, while the EU-27 was responsible for 6.4 percent of total emissions. "I think there is huge potential for the three parties to work together, but climate cooperation hasn't always been easy," said Ye Qi, Director of Institute for Public Policy at the Hong Kong University of Science and Technology. "But I think if we can all agree that by mid-century, if all the parties can agree on carbon neutrality, I think that would be a major, major achievement."