China Xi to join online climate summit hosted by Biden amid tensions Chinese President Xi Jinping will participate in the online climate change summit to be hosted later this week by U.S. President Joe Biden, the nation's Foreign Ministry said Wednesday, amid lingering tensions between the world's two major powers. Xi will make a speech on the first day of the two-day virtual gathering starting Thursday, which political leaders of other countries, such as Japanese Prime Minister Yoshihide Suga and Russian President Vladimir Putin, are also set to attend. China, the world's biggest carbon emitter, has expressed eagerness to work in tandem with the United States, the second-largest emitter, on combating the impact of global warming despite their increasing rivalry for military and economic supremacy.