Презентация на тему Экология и человек

times nature has served man, being the source of

his life. For thousands of years people lived in harmony with environment and it seemed to them that natural riches were unlimited.

enterprises have appeared all over the world today. The

byproduct of their activity pollutes the air we breathe, the water we drink, the land we grow grain and vegetables.

with about 1000 million tons of dust and harmful

substances. Many cities suffer from smog. Vast forests are cut and burn in fire. Their disappearance upsets the oxygen balance. As a result some rare species of animals, birds, fish and plants disappear forever, a number of lakes and rivers dry up.

ocean destruction of the ozone layer is the result

of man's careless interaction with nature, a sign of ecological crises.