The ozone hole is healing—and for the first time, scientists have the hard proof to back it up. A groundbreaking study led by MIT researchers and published in Nature confirms, with 95% statistical confidence, that the recovery of the Antarctic ozone layer is directly due to the global reduction of ozone-depleting substances like CFCs. Using advanced “fingerprinting” methods and decades of satellite data, the team—led by graduate student Peidong Wang and atmospheric science pioneer Dr. Susan Solo