US, China agree to combat climate change with 'urgency' By Hyung-Jin Kim article In this handout image provided by The U.S. Embassy Seoul, United States Special Presidential Envoy for Climate John Kerry speaks during a press conference on April 18, 2021 in Seoul, South Korea. John Kerry visits South Korea ahead of a U.S.-hosted c Expand SEOUL, South Korea - The United States and China, the world’s two biggest carbon polluters, have agreed to cooperate with other countries to curb climate change, just days before President Joe Biden hosts a virtual summit of world leaders to discuss the issue.