Covid-19 and climate change have dominated the agenda, as world leaders gathered in New York for the first day of the United Nations General Assembly.
Joe Biden gave his first speech there as US president and it was very different in tone to that of his predecessor Donald Trump, who was no fan of the UN.
Biden promised to replace an era of "endless war" with one of "relentless diplomacy" in the wake of America's exit from Afghanistan.
In a wide-ranging address, he promised to take a global lead on the climate, with a new pledge.
United Nations secretary general Antonio Guterres didn't mix his words on the inequitable distribution of COVID-19 vaccines, describing it as an "obscenity" that poorer regions of Africa have received minimal coverage.
He gave the globe an "F in Ethics."
There's a lot to digest. New York correspondent Will Denselow spoke to Susie Ferguson.
