Washington — President Joe Biden pledged to cut US greenhouse gas emissions in half by 2030 as he convened 40 world leaders in a virtual summit intended to demonstrate renewed American resolve to fight climate change and pressure wary nations to raise their own ambitions.

Biden announced in opening remarks for the two-day summit that the US will reduce its greenhouse gas emissions 50%-52% from 2005 levels by the end of the decade — boosting a commitment made under former president Barack Obama that was scrapped by former president Donald Trump...

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