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Pondelok, 17. júna 2024
Dátum pridania: 29.11.2005 Oznámkuj: 12345
Autor referátu: kristinka19
Jazyk: Angličtina Počet slov: 571
Referát vhodný pre: Vysoká škola Počet A4: 1.9
Priemerná známka: 2.94 Rýchle čítanie: 3m 10s
Pomalé čítanie: 4m 45s
The enironment means surroundings in which people, animals, and plants develop and exist.Ecology is a branch of biology which investigate relationships between living beings and their environment.
The most serious ecological problems of today are the pollution of air, water and soil, the destruction of ecosystem, disappearance of many species of animals and plants, the weather changes, acid rains, the warming up of the Earth´s surface, the destruction of tropical rain forests and the breaking of the ozone layer. These damages are caused by the man himself and his technical progress.

Pollution: We need air to breathe, water to drink and foot to eat, but there is a growing number of people in the Earth so that we have to share these everything with more people.The growing number of cars contribute much to the air pollution.Factories produce a large amount of dioxide, lead poisons etc.which get into the air.Some of them in combination with water make sulfuric acid in the clouds, it later falls as acid rain which kills treesand make soil infertile.Acid rain is causes damage to farms, fishes, lakes and buildings, human health.British goverment don´t enough reduce these damages.This damage cost the European Community more than 12 bilion libier every years.Enviromentalists plenting trees, flowers,...Acid rain is result of industrial polllution.Factories also pollute rivers because they put there their chemical waste.Also farmers pollute the soil using a lot of pesticudes and fertilizers.This pollution can also poison groundwater.I think that the best way how to reduce polllution is reducing, reusing and recycling.

Greenhouse effect: In the last 100 years the earth´s surface has warmed up by more than half a degree, this change could cause rising the sea levels by up to one and half meters by the year 2030.The Greenhouse effect is caused by polluted atmosphere which was polluted by carbon dioxide from fossilfuels and chlorfluorocarbons.
The best protection is to stop priducing these gases and destroying rain forests. It is worth replacing old power plants whith nuclear power which reduce the damage.Also nuclear power has its disadvantages, in this case there a e alternative sources of energy: hydropower, solar power, geothermal etc.
Ozone hole: The ozone gap is thinning at a rapid speed.It is a layer which protect us from dangerous UV rays, these could damage the life on the earth.Possible effects of the sun´s UV rays:Eyes: cataracts and blindness

Skin: premature aging, skin cancer and wrinkling
Immune system: they brake down the immune system
Crops: they could interrupt the process of photosynthesis
Sea life: grown of plankton which are a vital part of the food chain in the world´s oceans

The areas of largest ozone hole are Antarctida, South America, Australia,New Zeland

The main destroyers are CFC and halons which are used in refrigerators and air conditioners.Scientists estimate that one atom of chlorine can destroy 100 000 ozone molecules.
If the destruction of environment continues the life on this planet will be endangered.I recent years a lot of environmental organization have been found, e.g. Greenpeace, they develop their activities mainly in rich countries. They try to warm people by means of a lot of compaings, many of their suggestions were successful, e.g. using DDT was banned by law, or catalitic converters and unleaded petrol.All over the world are air acts, water pollution acts and endangered species acts, each countra has ministry for environment, too.
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