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environmental protection is the main problem facing humanity nowadays. the image of a sick planet has become firmly established in the public mind lately.

ten years ago the word 'ecology' hardly meant anything for the majority of people, but today we can't help bearing it in our minds. it has happened because of the growing effect of the rapid industrial development of the natural world which has negative features of its own. as a matter of fact the state of environment has greatly worsened of late.

there is no doubt that soil, water and air are contaminated with toxic wastes. over the past few years we have been constantly speaking about ozone holes, droughts, high level of radiation, about food contaminated with chemicals. scientists in many countries are very much concerned about drastic changes in weather patterns. the worst drought, the mildest winter and the most devastating hurricanes have become typical in those parts of the world where they used to be a rare occurrence.