Newswise: Increasing greenhouse gases could delay, or even postpone indefinitely, the recovery of stratospheric ozone in some regions of the Earth, a Johns Hopkins earth scientist suggests. This change might take a toll on public health. Darryn W. Waugh, a professor in the Morton K. Blaustein Department of Earth and Planetary Sciences at The Johns Hopkins University, and his colleagues report that climate change could provoke variations in the circulation of air in the lower stratosphere in …