U.S. President Joe Biden apologized to world leaders on Monday for his predecessor Donald Trump's withdrawal from Paris climate accord during the COP26 summit in Glasgow.

"I guess I shouldn't apologize but I do apologize for the fact that the United States in the last administration pulled out of the Paris Accords and put us sort of behind the eight ball a little bit," the president said, noting that one of his first actions on taking office this January was to re-enter the accord. 

Trump had argued that the Paris accord killed jobs. But in his main speech at the UN COP26 summit in Glasgow, Biden said that fighting climate change will boost economies.