ABSTRACT
The formation of our Earth's ozone layer allowed marine organisms to evolve into land-dwelling creatures, for it protected them from the lethal effects of ultraviolet radiation. Ongoing satellite monitoring of the ozone layer provides convincing scientific evidence that the problem is real and that the global trend toward ozone depletion needs to be monitored and carefully considered by policymakers. Many environmental problems that threaten the health of the planet, ozone depletion has received the attention and action of countries worldwide. Understanding causes of and mechanisms for ozone depletion can lead us to comprehend its potential consequences for human health and other biological systems. Ultraviolet radiation is most abundant in the upper atmosphere, the highest concentrations of ozone occur there. A dynamic balance of generation and degradation controls the amount of ozone in the stratosphere. Ultraviolet radiation is produced by the sun, and much of it is absorbed by atoms in the stratosphere.
