1. Say if the following statements are true or false. Correct the false statements.

1. Everybody is concerned with air pollution today.

2. Large cities seem to be the most highly polluted places.

3. All air pollution is due to man's activities.

4. A 'pea-souper' is the name for a person who is fond of eating pea soups.

5. Smog means smoke + fog.

6. The process of oxidizing is known as combustion.

7. Combustion causes problems because of the oxygen released into the atmosphere.

2. What environmental problems does air pollution cause? Fill in the table.

Problem	Pollutants	Cause	Consequences
...	...	...	...

3. You are taking part in the conference on the environmental problems. Deliver a report on air pollution.

Translate the following passage into Russian. Use the dictionary if necessary.

Say what new thing you have learnt about the ozone layer Depletion

The ozone layer depletion

Ozone (a molecule having three oxygen atoms) is the main component in the upper atmosphere at the altitude of 19-30 km. We depend on this 'good ozone' absorbing UV radiation from the sun thus protecting us from the risks of skin cancer and genetic mutations.

An abnormal lowering in concentrations of ozone at the South Pole was discovered in 1980. At the end of the southern winter, when the sun returns, the ozone content is found depleting by 40 to 60% . Traffic releasing NO, oceans emitting methylene chloride causing the chlorine build-up, man producing chlorofluorocarbons (CFCs) by his daily activities result in creating 'ozone holes,' that affect the climate and biological systems.

The scientists believe in mending the ozone holes. They object to releasing CFCs and other ozone-depleting gases into the atmosphere, the restrictions of the Montreal Protocol helping to achieve this aim. However, even after introducing a complete ban, it will be 50 years or more before pollutants levels reduce to their pre-ozone hole values.

Additional text.

WORLD TEMPERATURE RISE COULD BE A HOT POTATO

Look through the text and explain in Russian what happens with people when they move up from the Earth.

Concern (озабоченность) about a carbon-dioxide "greenhouse" warming up of the Earth in the near future seems to be growing- it is considered to be the major threat (угроза) to the natural climatic balance posed by human activities. There is still some uncertainty about how much of the measured increase in atmospheric carbon dioxide is a result of burning fuel (топливо) and how much is the effect of global deforestation (исчезновение лесов).

The concentration of carbon dioxide in the atmosphere is certainly in creasing, from just under 300 parts per million by volume (ppmv) in me late 19th century to 330 ppmv in the 20 th. But this increase represents only about half of the amount released by man's activities over the same period, and it is thought that the rest has been dissolved in the oceans.

How long this can continue, no one knows. So there is considerable uncertainty about the rate at which the concentration of carbon dioxide in the atmosphere will continue to grow and the uncertainty about how much will be produced by human activities over the coming decades. The simplest assumption is of continued growth, at least for the next 20 years. At that rate, however there would be essentially no tropical forest left, and projections beyond the end of the 20 th century become pure guesswork.

Another thing we don't know is how much "greenhouse" warming is produced by a given increase in carbon dioxide concentration. Various scientists have come up with figures in the range from 1°C to 3°C for the warming expected if the carbon dioxide content of the atmosphere doubles, and it might produce an overall warming of two degrees. But can this be right? And what will it mean in terms of effects on other climatic parametres, especially rainfall?

Scientists have been also studying links between changes in solar activity and temperature on the Earth, and have found an intriguingly close correlation between temperatures in the northern hemisphere and the ratio of dark central region (umbra) to light outer regions (penumbra) in sunspots.

If this significant correlation is used to subtract out the supposed effects of solar fluctuations on northern hemisphere temperatures since 1880, we are left with a warming trend which has brought an increase in temperature of between 0.3^oand0.4°C.

*Hot potato-злободневный вопрос