There is an ever-increasing amount of evidence that the earth's ozone layer is being depleted, allowing a higher proportion of ultraviolet radiation to reach the earth's surface. If allowed to continue, this would cause a serious increase in skin cancer cases, produce more eye disease and change the genetic make-up of terrestrial organisms. In addition, since ultraviolet radiation is an integral part of the earth's energy budget, any increase in its penetration to the lower atmosphere could lead to climatic change. The effects of a depleted ozone layer are widely accepted, but the extent of the depletion and its cause are still not completely understood. This reflects society's inadequate knowledge of the workings of the earth/atmosphere system in general, and the photochemistry of the stratosphere in particular. It may take many years of observation and research before this situation is altered, but in the meantime a general concensus among scientists and politicians, that CFCs are the main culprits in the destruction of the earth's ozone, has led to the proscription of that group of chemicals. By the end of this century, CFCs will no longer be produced, but their effects will linger on until those presently in the atmosphere are gone.

In dealing with the global aspects of air pollution involving such elements as acid precipitation, atmospheric turbidity and the threat to the ozone layer, it is quite clear that although society now has the ability to cause all of these problems, and may even possess the technology to slow down and reverse them, its understanding of their overall impact on the earth/atmosphere system lags behind. Until that can be changed, the effects of human activities on the system will often go unrecognized, response to problems will of necessity be reactive, and the damage done before the problem is identified and analysed may be irreversible.

The Basic Survival Guide

The Basic Survival Guide

Disasters: Why No ones Really 100 Safe. This is common knowledgethat disaster is everywhere. Its in the streets, its inside your campuses, and it can even be found inside your home. The question is not whether we are safe because no one is really THAT secure anymore but whether we can do something to lessen the odds of ever becoming a victim.

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