population

Length: 6 Pages 1575 Words

INTRODUCTION Human population in the past 48 years has more than doubled its seize, from 2.5 billion in 1950 to 5.9 billion in 1998 . A few month ago the Secrtary of the United Nation declared a baby as the No. 6 billion citezen of the earth. As you may have noticed, human population has reached a size that threatened our environment and the sustainability of the earth. Is the earth bounded to face this number of human? In fact, in the human history, human population increased stably over centruies until the Industrial Revolution. Thereafter, human population began to grow exponentially over decades. Unless death rate rates rise sharply, world population may reach 8 billion by 2025, 10-11 billionby 2050, and 14 bilion by 2100 . To sustain that many of people, the environment has already paid off. Population has a great impact on the environment. Deforestation, agricultural activities, and enviromental pollution, are either entirly or partly caused by the impact of human population. In th! is reseach paper, I will look these impacts, and state some perspective of the ecologists to these problems. AGRICUlTURAL ACTIVITIES IMPACT ON THE ENVIRONMENT Agriculture is not a direct way of human impact on environment. But in order to f Continue...


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So the Greenhouse Effect is in fact a natural effect, without it the Earth's surface would be at least 40 degrees Celsius colder than it is . But since the Industrial Revolution, the concentration of carbon dioxide in the atmosphere has been increasing dramatically . Most of the energy consumed today in the industrialised world comes from coal, oil and natural gas . The most significant one is that mass of water can cause earthquakes . The topsoil that washes and blows into the world's streams, lakes, and oceans each year woild fill a train of freight cars long enough to encircle the planet 150 times Many croplands that are now producing well be facing serious soil problem if current cultivation practices continue, because corn is relatively poor at holding soil, the corn-growing lands V about 7. 5 percent of all lands in cultivation, producing roughly one-fifth of the world's grain V will fare the worst . It is soon released again, but in a random direction. This is a problem which has confronted the human race since populations first concentrated in towns and cities . As cities grow and their water demands increase, expensive reservoirs and canals must be built and deeper wells drilled. First, we look at the burning coal in power stations. In the developing world , it is estimated that 90 of all sewage is discharged directly into rivers, lakes, and coastal waters without treatment of any kind . The Earth Report:Monitoring the Battle for Our Environment, Mitchell Beazley Publishers, London. Besides, the rest of the energy demanded, is supplied by hydrppower, nuclear power and some other Snew energy such as solar, wind, and wave energy.

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