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Protection of Environment Since ancient times Nature has served Man, being the source of his life. For thousands of years people lived in harmony -with environment. But with the development of civilization man's interference with nature began to increase. Large cities with thousands of smoky industrial enterprises appear all over the world today. They pollute the air we breathe, the water we drink, the land we live in. Many cities suffer from smog. Vast forests are cut and burn in fire. As a result some rare kinds of animals, birds, fish and plants disappear forever, a number of rivers and lakes dry up. Environmental protection is a universal concern. That is why serious measures to create a system of ecological security should be taken. Some progress has been already made in this direction. As many as 159 countries — members of the UNO (Union of Nations Organizations) — have set up environmental protection agencies. Numerous conferences have been held by these agencies to discuss questions of ecologically poor regions including the Aral Sea, the South Urals, Kuzbass, Donbass, Semipalatinsk and Chernobyl. An international environmental research centre has been set up on Lake Baikal. The international organization Greenpeace is also doing much to keep the environment. The Earth is our home. We must take care of it for next generations and ourselves.