ozone hole

Plant a tree or two to help out the ozone hole.

The results also confirmed the ozone hole of the 1980s.

Last year's ozone hole was average in size and depth.

Purple and dark blue areas are part of the ozone hole.

In September 2000, the ozone hole opened up to a record 17.1 million square miles.

"If these ozone holes keep growing like this, they'll eventually eat the world."

"This is the first step toward the goal of closing the ozone hole."

The ozone hole opened the world's eyes to the global effects of human activity on the atmosphere.

Last year the ozone hole was smaller, covering 8.1 million square miles.

C1 Major effort is mounted to measure impact of the ozone hole.