Главная / Рефераты / Рефераты и топики по иностранным языкам
Доклад: Ecological problems
Notice: Undefined variable: ref_img in /home/area7ru/area7.ru/docs/referat.php on line 323
Ecological problems
The Earth is the only planet in the solar system where there is life. If you look down at the Earth from a plane you will see how wonderful our planet is. You will see blue seas and oceans, rivers and lakes, high snow-capped mountains, green forests and fields. For centuries man lived in harmony with nature until industrialization brought human society into conflict with the natural environment. Today, the contradictions between man and nature have acquired a dramatic character. With the development of civilization man’s interference in nature has increased. Every year the world’s industry pollutes the atmosphere with millions of tons of dust and other harmful substances. The seas and rivers are poisoned with industrial waste, chemical and sewage discharge. People who live in big cities are badly affected by harmful discharge from plants and city transport and by the increasing noise level which is as bad for human health as lack of fresh air and clean water.
Among the most urgent problems are the ozone layer, acid rains, global warming, toxic pollution of atmosphere, disappearance of forests, contamination of underground waters by chemical elements, destruction of soil in some areas, threat to some flora and fauna representatives, etc.
One of the most important pollution problems is the oceans. Many ships sail in the ocean water- fishing ships, some ships carrying people, some carrying oil. If a ship loses some of the oil in the water, or waste from the ships in put into the ocean, the water becomes dirty. Many sea birds die because of the polluted water. Many fish are dying in the sea, others are getting contaminated. Fishermen catch contaminated fish which may be sold in markets, and people may get sick from eating them. Lakes and rivers are becoming polluted, too. Some beaches are dangerous for swimming.
Another important problem is air pollution. Cars and factories pollute the air we use. Their fume also destroys the ozone layer which protects the Earth from the dangerous light of the Sun. Aerosols create large “holes” in the ozone layer round the Earth. Burning coal and oil leads to global warming which may bring about a change in the world’s climate.
The other problem is that our forests are dying from acid rains. Deforestation, especially destruction of tropical forests, affects the balance of nature in many ways. It kills animals, changes the climate and ecosystem in the world.
A person can do some damage to the environment but the greater part of pollution certainly comes from industry. Modern industry production is the main threat to nature.
There are a lot of places on our planet that need immediate help. Our country is not exception. The nuclear accident at Chernobyl, which took place on April 26, 1986., has seriously aggravated the ecological situation in Belarus. That catastrophe can be considered as the largest disaster of the 20th century. As the result of that accident 18% of territories of our republic were contaminated by radioactive elements. The agriculture of our country suffered great losses. More than 20% of the population has also suffered. A death rate among children has increased considerably. The wide researches are carried out, but health state of the people living in polluted areas, is worsened. The level of thyroid gland cancer has increased, the immunity of children and women is weakened, many diseases appear out only a few years later. Everyone understands that this catastrophe is a threat to health of our nation, and though years have already passed, the results will be shown on the future generations.
I’d like to say a few words about animals in danger of extinction. The blue whale is the largest animal which has ever lived. Once there were over 200000 of these creatures living in the Atlantic and Pacific oceans. Since the seventeenth century they have been hunted for their oil and meat. In fact, so many of them were killed that by 1963 their population had been reduced to just 1000. Today it is even less that that. The African elephant is the world’s largest land animal. Today there are fewer than one million of these animals left. Even though they are now protected, they are still being hunted because of their tusks, which are used to make ornaments and jewellery. There is only one way to save wild animals and wild habitats –conservation. That means protecting animals in danger by law, opening more national parks, building fewer new roads, planting more new forests, cutting pollution. It this doesn’t happen, many wild animals will soon have just one habitat- the Zoo.
Ecological problems have no borders. European states solve these problems together: the necessary measures are taken, congresses and conferences on these questions are organized, and these questions have already the reflection in the legislation of many countries.
The activity of many public organi...
ВНИМАНИЕ!
Текст просматриваемого вами реферата (доклада, курсовой) урезан на треть (33%)!
Чтобы просматривать этот и другие рефераты полностью, авторизуйтесь на сайте:
|
|
|
Добавлено: 2011.04.23
Просмотров: 1245
|
Notice: Undefined offset: 1 in /home/area7ru/area7.ru/docs/linkmanager/links.php on line 21
При использовании материалов сайта, активная ссылка на AREA7.RU обязательная! |
