Chinese President Xi Jinping, left, and President Joe Biden, in 2012 when each was the vice president of his country. | Jay L. Clendenin/Getty Images To be legitimate climate leaders on the world stage, the US and China must start by raising ambition at home. Top officials from the US and China met in Alaska this week for their first face-to-face meeting since President Joe Biden took office. On the agenda was a full range of issues of importance to both sides — not least of which is climate change.