ound us that rapid industrial development and overpopulation create environmental hazards that threaten populations themselves. This does not always mean human populations. For example, in the first half of the 1990s, scientists were concerned over the disappearance of frogs in Oregon. Studies showed that a thinning of the Ozone layer from industrial and human pollution was the cause of the disappearance of a species that first developed over 150 million years ago, “By 1994 a probable cause had been ascertained as a result of a series of experiments conducted in Oregon. UV-B, exposure to which is increasing due to the thinning of the ozone layer, was discovered to be killing frog eggs exposed to sunlight…announcing to the world that the threat of a silent spring is more than ever before us and on a truly global scale” (Foster 7).
It is likely we have all notices changing weather patterns and atmospheric conditions over the past decade. It stays warmer in the fall and early winter in the east, and it often becomes colder than traditionally and even snows in the far west
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