Methane in the atmosphere had its fourth-highest annual increase in 2022, the National Oceanic and Atmospheric Administration reported, part of an overall rise in planet-warming greenhouse gases that the agency called “alarming. ”Though carbon dioxide typically gets more attention for its role in climate change, scientists are particularly concerned about methane because it traps much more heat — about 87 times more than carbon dioxide on a 20-year timescale. 7 ppb, largely due to fertilizers and manure from the expanding agriculture sector