In contrast to the troposphere, the stratosphere is extremely dry and practically cloudless - the concentration of water vapor is measured in parts per million and is, in fact, comparable to that of ozone.
From Mario J. Molina
One action society needs to take is to use energy much more efficiently. Instead of incandescent light bulbs, you could switch to LEDs that consume a lot less electricity, for example.
One of the very rewarding aspects of my work has been the interaction with a superb group of colleagues and friends in the atmospheric sciences community.
Laboratory experiments, field observations and atmospheric modeling calculations have now established that chemical reactions occurring on PSC particles play a central role in polar ozone depletion.
The basic science is very well established; it is well understood that global warming is due to greenhouse gases. What is uncertain is projections about specifics in the next few decades, by how much will the climate change.
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