B11

One of the most important environmental problems in the world today is the shortage of clean water.

ENVIRONMENT

B12

Industrial pollution has made many sources of water undrinkable.

DRINK

B13

Thousands of fish die every year as a result of the illegal dumping of waste in rivers by factories all over the world.

DUMP

B14

Lake Baikal is one of the world’s largest and most beautiful lakes. It contains a rich variety of fish and plants.

VARY

B15

However, they are being killed by the massive industrial waste, which some factories still pour into the lake every day. A few years ago people thought that the supply of clean water was limitless.

LIMIT

B16

Now clean water is scarce, and water protection has become a vital necessity for all people.

PROTECT