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!
