United States climate envoy John Kerry is in China for talks on Thursday, ahead of President Joe Biden’s climate summit of world leaders. The US and China are the world’s biggest carbon emitters and have both set targets to become carbon neutral in coming decades. China plans to achieve that goal by 2060, but analysts have warned that heavy reliance on coal and modest short-term targets could make that difficult. Why is Kerry’s trip important? The trip marks the highest-level trip to China so far for officials of the Biden administration. Kerry’s visit is seen as a chance to put aside existing political tensions and focus on areas of potential climate collaboration. His visit comes amid heightened agitation over human rights, trade and China’s territorial claims to Taiwan and the South China Sea.