Step 2

Your task is to go through all these links and  study the material about ecological problems of the Earth .

    Our Earth is a beautiful home for living beings, common for all the humanity forever.

    The number of the planet’s population is in increasing constantly, but the technical progress not only for the people’s welfare, but also threatens the life itself. When people pursue great profits, they often act unwisely- destroy nature, pollute the environment. The poisoning of air, land and oceans is the fastest spreading disease of civilization.

Air pollution

Air pollution is a community problem. Cars, trucks, buses and airplanes are the worst polluters. They send partly burned gases into the air. Air can be also polluted by smoke and gases from factories. Dirt, smoke, and gases in the air may be carried away by wind and by air currents, or settle over as a blanket of smog.

Water pollution

Water pollution is caused by dumping wastes into lakes, rivers, and other bodies of water. Harmful wastes may also get into the soil or drain off fields that have been sprayed with pesticides. Pesticides are often used to kill insects and weeds in cities or on farms. Polluted water can spread many diseases.

Radiation

    Radiation has become one of the main problems. There are some atomic power stations in our country. It is even a greater disaster for the world. We all remember about Chernobyl catastrophe and its tragic results. Many people, who fought against that fire and received a certain doze of radiation are invalids now.

Earthquakes

Earthquakes is too difficult to forecast them

    and many scientists devote themselves to  

    protect our lives.

The problem of forests felling

Our forests are disappearing because they are

   cut down or burnt. If this trend continues, one

   day we won’t have enough oxygen to breathe,

   we won’t see a beautiful green forests at all.

The problem of biological variety

Every ten minutes one kind of animals, plants or insect dies out forever. If northing is done about it, one million species that are alive today may soon become extinct.

Global warming

    Each time we burn gasoline, oil, coal, or every natural gas, more carbon dioxide is added to the atmosphere. The greenhouse effect is what causing the temperate of the Earth to rise, and creating many problems that will begin to take place in the coming decades.

The hole in the ozone layer

Ozone absorbs harmful ultraviolet radiation which is produced by Sun. Ultraviolet radiation can damage cells of living things- plants, animals and people. The damage of ozone has been caused by complex chemical reactions involving chlorine and bromine.