A potent planet-warming gas is seeping out of US landfills at rates higher than previously thought, scientists say CNNMethane From Landfills Is a Big Driver of Climate Change, Study Says The New York TimesAerial surveys show US landfills are major source of methane emissions ReutersLandfills bake the planet even more than we realized GristMethane From US Landfills 40% Greater Than Reported, Study Finds Bloomberg