Xi Jinping of China and Vladimir Putin of Russia are among 40 world leaders President Joe Biden invited Friday to a virtual summit event the United States is hosting next month designed to galvanize support among top greenhouse gas-emitting countries for addressing climate change.

Hosting the summit April 22-23 was one of Biden’s campaign promises as a means toward encouraging countries to strengthen their commitments as part of the Paris Agreement that Biden re-entered after former President Donald Trump removed the U.S. from the pact.

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