Progress Watch Earth's ozone layer: Scientists hail first hints of recovery (+video)

The 1987 Montreal Protocol, which banned the production of 100 chemicals, is having an impact. Scientists expect full recovery of Earth's ozone layer by midcentury.

By , Staff writer

NASA/AP

High in Earth's stratosphere, a protective shield of naturally occurring ozone is showing the first signs of recovery, with full recovery expected over much of the planet by midcentury, including the Arctic. Antarctica should catch up a few years later.