A key two-day climate climate summit starting Thursday, hosted by U.S. President Joe Biden, aims to show that America is once again ready to take a leading role on enacting policies and cutting greenhouse gas emissions to prevent catastrophic global warming.

But convincing the leaders of the 40 invited countries to pledge the deep cuts to emissions by 2030 that scientists say are needed could prove difficult. International concerns remain about the U.S.’s own ability to keep such promises if a different presidential candidate wins in 2024, and there are questions over Biden’s ability to convince China, the world’s No. 1 greenhouse gas emitter, to agree to a strong target.

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