Noise can actually be a form of pollution that characterizes urban and industrial areas. It affects not only the human hearing, but all our functions. The unit for measuring how loud a sound is, is called decibel. One decibel describes the minimum difference between two sounds, so that they are audible by humans. Whispering has an intensity of 20 decibel, while the sound produced by an aeroplane taking off, intensity of 150 decibel.
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Possibly the most graphic treatment of global warming that has yet been published, Six Degrees is what readers of Al Gore's best-selling An Inconvenient Truth or Ross Gelbspan's Boiling Point will turn to next. Written by the acclaimed author of High Tide, this highly relevant and compelling book uses accessible journalistic prose to distill what environmental scientists portend about the consequences of human pollution for the next hundred years.
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