POLLUTION.

Acid Rain. Greenhouse Effect. Global Warming. Ozono layer depletion. Water Pollution. Waste Waters. Smog.

What is Acid Rain?.What is Acid Rain?.

It is caused by oxidize of nitrogen and dioxide of sulphur.

Factories, electric power stations and petroleum are the responsable of the acid rain.

These contaminated gases are part of the water of the clouds.

When it rains pollution can go to rivers, the forests, lakes, seas, etc.

When it happens, as like the picture, the contaminated rains can destroy the forests.

Solutions.

Reduce the level of sulphur in fuels.

Control the emissions of gases in factories.

Reduce the use of coal and electric power stations to produce electricity.

Use hybrid or electric cars.

Use public transportation like buses, subway or tram.

What is Greenhouse Effect?.

It is caused by carbon dioxide and methane in the atmosphere.

These two gases cause that part of the radiation of the sun is not going back again to the atmosphere.

From the beginning of the Industrial Age the level of emissions has been increased a lot

Only in the last years the population and the countries have been conscious of the seriousness of the problem.

Kyoto's Protocol

It is a global agreement to reduce the levels of gases that are causing the global warming.

It was signed in 1997 in the japanese city of Kyoto.

Countries were agree to reduce gas emissions.

The problem is that USA refused to apply the protocol and other countries such as China and India are not included and today the emissions of these two countries are increasing a lot.

What is Global Warming?What is Global Warming?

From the XVIII century our civilization began to use massively fossil fuels as carbon and petroleum

In last 150 years the global temperature in the planet have been increased about one grade.

By the year 2050 as climate of the planet is warming, the temperature could rise about two grades.

Some of the effects of the global warming could be: Climate changes. Melting of the poles. Melting of the glaciers. Floods. Expansion of some

diseases, parasites as mosquito, etc.

The future is tomorrow, Global warming is now.

Water PollutionWater Pollution

It is caused by the humans, factories, agriculture, ranching, etc.

The pollution of rivers, lakes and aquiferous.

The pollution of seas and oceans.

What are the waste waters?

It is caused by the human activity.

Waste waters included the waters from the bathrooms, kitchens,washing machines, the dumps, etc.

Waste waters are responsible of the contamination of the rivers, seas and oceans.

The waste waters must be treated in specialized water plants before to return this water to the rivers or the sea.

In Spain, cities with more than 10.000 people must to treat the waste water.

Depletion of the ozone layer.

It is caused by the CFC (molecule of chlorine).

The chlorine cause a destruction of the molecule of ozone in the atmosphere.

The ozone is basic for the living in the earth: the cap of ozone filter the sun radiation.

The hole was discovered in the 80's in the Arctic zone.The hole in this zone had been reduced about 50%.

From the beginning of the 90's we have not used CFC but we use another gases that contributes to global warming.

SMOG:The word "smog" was made in the

early 20th century as a portmanteau of the words smoke and fog. The word was then intended to refer to what was a serious

problem in London from the 19th century to the mid 20th century. This kind of smog is caused by the burning of large

amounts of coal within a city and derived from cars emissions and industrial fumes

Smog in San Francisco, USA

Smog in New York City, USA

Smog in Los Angeles, USA

Smog in Beijing, China

Smog in Beijing, China

Smog in Sao Paulo, Brazil

wikipedia

Where does smog come from?

Emissions from factories

UCAR

Emissions from power plants

wikipedia

Emissions from oil and gas wells

Emissions from cars and trucks