NASA scientists have revealed the inner workings of the
ozone hole that forms annually over Antarctica and found that declining
chlorine in the stratosphere has not yet caused a recovery of the ozone hole.
More than 20 years after the Montreal Protocol agreement
limited human emissions of ozone-depleting substances, satellites have
monitored the area of the annual ozone hole and watched it essentially
stabilize, ceasing to grow substantially larger. However, two new studies show
that signs of recovery are not yet present, and that temperature and winds are
still driving any annual changes in ozone hole size.