Вступление

 

 

Let's use our imagination and think of the apple as the Earth.

Let's cut the apple into quarters. Look! Three quarters of the Earth's surface is water and only one quarter is land.

If we cut the piece representing land in half you will see that only one-half the land or one/eighth of the Earth's surface is habitable. The rest of the land is the deserts, mountains, frozen ice caps and other places where people can't live. What will happen if we do not protect it and this part of the world is destroyed? Yes, nothing will be able to live on it.

Three quarters of the Earth's surface represent water but only one per cent of Earth's water is fresh and drinkable.

Each year there are more and more people living on the Earth, yet the amount of water remains the same.

We must remember about it in our everyday life.

Our planet is in danger because peoples activities disturbed the ecological balance in nature and caused great problems. We got interested in some of them studied some articles and papers. We'd like to emphasize these problems by reporting our researches.