U.N. scientists say they expect a "normal" ozone hole this year. Geir Braathen of the World Meteorological Organization says it's still too early to say for sure how big the ozone hole will be over Antarctica.
U.N. scientists say they expect a "normal" ozone hole this year. Geir Braathen of the World Meteorological Organization says it's still too early to say for sure how big the ozone hole will be over Antarctica.