In what part of the atmosphere is the protective layer of ozone located?
About what percentage of the sun's harmful UV radiation is kept from reaching the earth's surface by the stratospheric ozone layer?
What is the "ozone hole" and when and where does it occur?
What are the possible consequences of the depletion of stratospheric ozone?
What are chlorofluorocarbons (CFCs)?
Why were the CFCs originally called "dream chemicals"?
What are some of the uses of CFCs?
Why don't CFCs "rain" out of the troposphere?
How long does it take CFCs in the troposphere to rise into the stratosphere?
How do CFCs in the stratosphere contribute to ozone depletion?
How long can a CFC last in the stratosphere?
What are ozone depleting compounds?
What are some ozone depleting compounds other than CFCs?
What are some natural sources of ozone depleting compounds?
Of the observed ozone loss in the stratosphere since the late 1970s, what percentage of that loss has been attributed to compounds released into the atmosphere by human activities?
What is meant by seasonal thinning of the ozone layer over Antarctica?
Approximately what percentage of the ozone over Antarctica is destroyed each Antarctic spring and summer?
Why is the loss of ozone over Antarctica seasonal?
What are the possible effects of increased UV reaching the earth;s surface?
What have been some of the efforts to reduce ozone depletion?
Why does the World Meteorological Organization say that even if we stopped all ozone-depleting compound emissions immediately the depletion of the ozone layer would continue for several decades?