The US President has taken a swipe at China and Russia for not having their leaders at the Cop26 climate summit.
Joe Biden says it was a mistake and they've lost influence.
World leaders have been leaving the summit in Scotland, with delegations left to continue talks.
Meanwhile, 450 private firms - which hold 40% of the world's money - are joining a pledge to limit global warming.
US Special Presidential Envoy for Climate, John Kerry, says their help's badly needed.
"$100bn doesn't do it folks,
"It's trillions of dollars that are needed.
"The only way that we will get this done is if trillions of dollars are forthcoming - and they are.
"There will be tens of trillions of dollars announced."
