"Nitrous oxide (N2O) has become the greatest threat to the ozone layer, a new analysis suggests. The ozone-destroying abilities of the gas have been largely ignored by policy-makers and atmospheric scientists alike, who have focused on the more potent chlorofluorocarbons (CFCs)-historically the dominant ozone-depleting substances in the atmosphere." So says Nature magazine, reporting on the work of the National Oceanic and Atmospheric Administration in Boulder, Colorado (figures.) READ MORE