Прочитайте текст и определите какой из заголовков соответствует тексту Since 1850 there has been a m...: ответ на тест 606537 - Английский язык

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Since 1850 there has been a mean rise in global temperature of approximately 1 0 С (1.8° F), but this rise could just be part of a natural fluctuation. Such fluctuations have been recorded for tens of thousands of years. The potential consequences of global warming are so great that many of the world's top scientists have urged immediate action, and have called for international cooperation on the problem.

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Since 1850 there has been a mean rise in global temperature of approximately 1 0 С (1.8° F), but this rise could just be part of a natural fluctuation. Such fluctuations have been recorded for tens of thousands of years. The potential consequences of global warming are so great that many of the world's top scientists have urged immediate action, and have called for international cooperation on the problem.

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Every year more and more plants and animals disappear forever. Strangely, it is the most intelligent but most thoughtless animal that is causing most of the problems - man. Nature is very carefully balanced and if this balance is disturbed, animals can disappear alarmingly fast. Every day, thousands of species of animals draw closer to extinction. In many lakes fish are dying. Fishermen are worried because every year there are fewer fish and some lakes have no fish at all. Scientists are beginning to get worried too. What is killing the fish? The problem is acid rain.

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Acid rain is a kind of air pollution. It is caused by factories that burn coal, oil and gas. These factories send smoke high into the air. The wind often carries the smoke far from the factories. Some of the harmful substances in the smoke may come down with the rain hundreds of miles away.

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The rain in many places isn’t natural and clean any more. It’s full of acid chemicals. When it falls in lakes, it changes them too. The lakes become more acidic. Acid water is like vinegar or lemon juice. It hurts when it gets in your eyes. It also kills the plants and animals that usually live in lake water. That is why the fish are dying in lakes. Dead fish may be just the beginning of the problem.

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Scientists are finding other effects of acid rain. In some large areas trees are dying. Not just one tree here and there, but whole forests. At first scientists couldn’t understand why. There were no bugs or diseases in these trees. The weather was not dry. But now they think that the rain was the cause. Acid rain is making the earth more acidic in these areas. Some kinds of trees cannot live in the soil that is very acidic.