The ozone layer that protects life on Earth may not be recovering from the damage it has suffered over the Arctic region as quickly as scientists previoulsy thought, according to a paper published in the May 26 issue of the journal Science. More polar stratospheric clouds than anticipated are forming high above the North Pole, causing additional ozone loss in the sky over the Arctic, according to Dr. Azadeh Tabadeh, head author of the paper and a scientist at NASA's Ames Research Center in California's Silicon Valley.