- 引用 删除 yan9085 / 2010-08-03 14:43:35
The history of life on earth has been a history of interaction between living things and their surroundings. To a large extent, the physical form and the habits of the earth's vegetation and its animal life have been molded by the environment. Considering the whole span of earthly time, the opposite effect, in which life actually modifies its surroundings,has been relatively slight. Only in the present century has one species--man acquired significant power to alter the nature of his world.
During the past quarter century this power has not only become increasingly great but it has changed in character.replica sunglasses The most alarming of all man's assaults upon the environment is the contaminatien of air, earth, rivers, and sea with dangerous and even lethal materials. This pollution is for the most part irrecoverable. In this now universal contamination of the environment, chemicals are the sinister partners of radiation in changing the very nature of the world, the very nature of its
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It took hundreds of millions of years to produce the life that now inhabits the earth. age of conan gold Given time not in years but in millennia life adjusts, and a balance has been reached. But in the modern world there is no time.
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It is not my contention that chemical insecticides must never be used.age of conan power leveling I do contend that we have put poisonous and biologically potent chemicals indiscriminately into the hands of persons largely
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The most pressing problem created by the rapid increase in population is a shortage of food.maple story mesos More mouths have to be fed every year and yet a high proportion of the existing population are not getting enough of the right kind of food. Over the past two years the total amount of food has decreased, and of course the total amount of food per person has decreased even more sharply.
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More and more of the babies born in developing countries have been surviving infancy, world of warcraft power leveling and now nearly half the people living in those countries are under the age of 15. The adults have to work harder than ever to provide for the needs of the children,who cannot contribute to the economy until they are older. There is a shortage of schools and teachers, and there are not enough hospitals, doctors and nurses. Farming land is becoming scarce,so country people are moving to the towns and cities in the hope of finding a better standard of living. But the cities have not been able to provide housing, and the newcomers live in crowded slums.Finally, there are too few jobs, and unemployment leads to further poverty.
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