Слайд 2Since ancient times nature has served man, being the source of his
life. For thousands of years people lived in harmony with environment
Слайд 3 But with the development of civilization man's interference in nature began
to increase ...
Слайд 4Large cities with thousands of smoky industrial enterprises have appeared all over
the world today.
Слайд 5The byproduct of their activity pollutes
the air we breathe
the water
we drink
the land we grow grain
Слайд 7Vast forests are cut and burn in fire
Слайд 13a number of lakes and rivers dry up
Слайд 14We faces many ecological problems
Слайд 23The environment is so beautiful! We should preserve it!