oe Biden gave an important speech before he is due to host Boris Johnson at the White House later on Tuesday.
Leaders have been discussing the coronavirus pandemic, climate change, China and the future of Afghanistan.
In his empowering speech, Mr Biden said: “This is the clear and urgent choice that we face here at the dawning of what must be a decisive decade for our world. A decade that will quite literally determine our futures.
“As a global community, we are challenged by urgent and looming crises, wherein lie enormous opportunities if, if we can summon the will and resolve to cease these opportunities.”
He added: “Will we work together to save lives, defeat Covid-19 everywhere and take the necessary steps to prepare ourselves for the next pandemic?
“Or will we fail to harness the tools at our disposal as the more virulent and dangerous variants take hold?
“Will we meet the threat of challenging climate we are all feeling, already ravaging every part of our world with extreme weather?
“Or will we suffer the merciless march of ever worsening droughts and floods, more intense fires and hurricanes, longer heatwaves and rising seas?”
Mr Biden predicts extreme weather will cost the US more than $100bn this year.