Автор работы: Пользователь скрыл имя, 21 Декабря 2011 в 12:30, реферат
Science is a source of progress. It develops the world we live in. Our century is an epoch of great discoveries in science and engineering. It is epoch of scientific and technological revolution, when new ideas are being born and new discoveries, inventions are being made at an ever increasing rate. Today science has become the most important factor in the development of national economy in the whole world. Scientific progress serves the interests of society, helps to increase the well - being of people and develops public education.
Science ………………………………………………………………………………………….………...….3
Scientific and technological progress………………………………………………………….……..…..3
World Environmen……………………………………………………..……………………………..……4
Nature and Ecology………………………………………………………………………..…..….………..4
Why is it important to conserve biological diversity………..………………………………………….4
What should we do…………………………………………………………………………………..………5
Protection of nature…………………………………………………………………………..…….…..….5
Caring for the environment………………………………………………….………………….……….…6
Nature conservation………………………………………………………………………………….….….6
What brings humanity to nature…………………………………………..………………………………7
The influence of modern humans in the northern nature………………..…….……………………..7
What causes people to smoke……………………………………………………………
Smoke let people receive good emotions — that’s the main reason to smoke. When a smoker is nervous, he can burn one cigarette after another, in order to calm down. He smokes when he is in a bad mood and when he is happy, to make himself even happier. And when he smokes, he forget of everything harmful what is connected to smoking. Meanwhile, cigarettes do the injurious effect, which is not clearly noticeable to the smoker. All the consequences seem to be not actual and very distant, until the time they will make the smoker remember about nicotine’s harm.
Millions of people die because of these consequences every year. Nicotine and smoking pitch lead to cancer, the illness which is not curable. Cancer can choose a place to appear: in most cases, smoking causes lungs cancer, but not really always. Medicines are powerless in such cases, only surgical experience may help, in several situations. But surgical operations are useless in especially complicated cases, as a rule. Patient dies in several weeks or months.
Nicotine does irreversible changing in circulatory system and heart, as well as in respiratory tracts and lungs. Smokers are usually short-winded, they have problems with physical training and endurance. In late stadiums of nicotine dependence there are numerous cases of paralysis of extremities and even gangrene.
Without a cigarette they cannot work properly, they become annoyed and unsociable. Nicotine absence produces a lot of problems for a smoker. Overall, nicotine is dangerous both for physical and mental systems.