New research from Colorado State University shows that U.S. irrigation delivers a massive climate benefit: it prevents about 363 times more greenhouse gas emissions than it produces. By boosting crop yields, irrigation allows farmers to grow the same amount of food on less land, avoiding the need to convert forests and grasslands into farmland. The study, published in PNAS, estimates avoided emissions at 6.86 gigatons, more than all U.S. emissions in 2024. The main source of irrigation emissions is fossil fuel-powered water pumps. The researchers say electrifying those pumps could cut emissions further, especially as the grid gets cleaner. They also note trade-offs in water use, particularly in the western U.S. This work adds a key piece to climate-smart agriculture policy by counting both direct and indirect land-use effects.
