President Biden this week will pledge to slash U.S. greenhouse gas emissions at least in half by the end of the decade, according to two people briefed on the plan, as part of an aggressive push to combat climate change at home and persuade other major economies around the world to follow suit. The move comes as Biden convenes a virtual summit of more than three dozen world leaders Thursday, aimed at ratcheting up international climate ambitions and reestablishing the United States as a leader in the effort to slow the planet’s warming.

The planned U.S. pledge represents a near-doubling of the target that the nation committed to under the 2015 Paris climate agreement when Barack Obama vowed to cut emissions by 26 to 28 percent compared with 2005 levels. Asked for comment, a White House official said a final decision had not been made.

“The Biden-Harris administration will do more than any in history to meet our climate crisis,” Secretary of State Antony Blinken said in a speech Monday. “This is already an all-hands-on-deck effort across our government and across our nation. Our future depends on the choices we make today.”

The administration is likely to first offer broad strokes rather than a detailed breakdown of how it will meet the more ambitious target, according to the people briefed on the matter, who spoke on the condition of anonymity because the plan had not been formally announced. Officials are considering a target range, they added, that could go above 50 percent at the higher end.