1 They will press for international action to safeguard the ozone layer.
2 Various ecological issues have come to the fore since the discovery of the hole in the Earth's ozone layer.
3 Scientists have observed a drop in ozone levels over the Antarctic.
4 Global warming could be accelerated due to the thinning of the ozone layer.
5 What they find could provide clues to what might happen worldwide if ozone depletion continues.
6 The ozone layer surrounding the earth protects our skin from being hurt by the ultraviolet rays.
7 It also changed the monitoring period for ozone to better reflect actual air quality.
8 Depletion of the ozone layer leaves the earth's surface increasingly exposed to harmful radiation from the sun.
9 These gases - we now know - affect something called the ozone layer, which protects the earth from the heating of the Sun's radiation.
10 The ozone layer shields the planet from damaging ultra-violet rays, which can cause skin cancer and eye cataracts, and has been recovering after a phase-out of damaging chemicals under the U.N.'s 1987 Montreal Protocol.