Washington — President Joe Biden tried to hammer out the world’s next steps against rapidly worsening climate change in a private, virtual session with a small group of other global leaders Friday, and announced a new U.S.-European pledge to cut climate-wrecking methane leaks. Ever-grimmer findings from scientists this year that the world is nearing the point where the level of climate damage from burning oil, gas and coal becomes catastrophic and irreversible “represent a code red for humanity,” Biden said at the session’s outset. “We have to act and we have to act now,” Biden said, speaking on a specially erected White House set that showed virtual arrays of solar panels in the background and a wall of other global leaders listening on screens. He cited his tour earlier this month of communities hit by relentless wildfires in California and Hurricane Ida in the northeastern U.S.