The latest area of competition between the US and China: Saving the world

With Washington rejoining international efforts against climate change under President Joe Biden, the United States and China now have a new area of competition -- leading the world in staving off environmental catastrophe.

On Wednesday, Biden hosted a virtual two-day climate summit attended by 40 other world leaders, including Chinese leader Xi Jinping, who just three days earlier criticized the US for "bossing others around" at another forum.