Environmental problems презентация

the world has many problems , but I chose an environmental issue because in my opinion this is the most important.

1 the problem - pollution of rivers , seas, oceans.
Pollution can specify such features as dead fish. One of the indicators - biochemical oxygen

2 problem is the air pollution.
Every year there are about 3.7 million people die because of air pollution. The total number of deaths associated with exposure to air pollution both indoors and in the atmosphere reaches 7 million per year.

3 the problem of pollution of land
Environmental hazard is the fact that in the human the natural environment exceeded the content of certain chemical substances .