Xi, Putin welcome at climate summit: Biden

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US President Joe Biden has extended invitations to 40 world leaders for an online summit on the climate crisis hosted by his administration next month, with rivals Xi Jinping of China and Vladimir Putin of Russia on the guest list.

Biden told reporters he had not yet spoken to Xi and Putin about it, "but they know they're invited".

The White House said on Friday the summit - scheduled for April 22 and 23 - was intended to underscore the urgency with which the world must act and highlight the economic benefits of going green.

European leaders including German Chancellor Angela Merkel, French President Emmanuel Macron and British Prime Minister Boris Johnson were invited.

So were Saudi King Salman bin Abdelaziz, Brazilian President Jair Bolsonaro, Indian Prime Minister Narendra Modi and Turkish President Recep Tayyip Erdogan.

The event is expected to be virtual given pandemic restrictions.

The US will announce an "ambitious" new 2030 emissions target for the country by the time the summit gets under way, the White House said, part of Washington's new push to meet the goals of the Paris climate agreement.

Biden urged other leaders to use the summit as a forum in which to outline their own new, more forceful contributions. The next UN climate conference is in Glasgow, Scotland, in November.