Environmental problems Greenhouse effect

As a result of the greenhouse effect global warming is happening, which turns droughts. Burn huge areas of forests and fires released CO2 enhances the greenhouse effect.

Contained in the atmosphere of carbon (CO2) plays a big role in the life of humans, plants and animals, protecting the earth from overheating and radiative cooling. But human activities - burning huge mass consumption - violated the CO2 balance in nature that poses a threat to the greenhouse effect - a significant warming, melting ice caps, rising sea levels.

Atmospheric pollution by sulfur dioxide and nitrogen oxides generated a phenomenon such as acid rain. They destroyed almost half of the forest vegetation in Europe.

The problem of fresh water

Many countries face serious water resource problems that are not only in quantitative water scarcity, but also in short supply of clean fresh water. Annually in reservoirs misses a huge amount of raw sewage. Among the most polluted rivers and lakes in the world of the Danube, Rhine, Seine, Mississippi, Volga, Dnieper, Ladoga lake, Balkhash, etc.

Table. Countries of the world, clean water-deficit (where less than 50% of the population has access to clean drinking water).

Country	Having access to fresh water
The Afghanistan Ethiopia Chad Sierra Leone Cambodia Mauritania Angola Oman Rwanda Papua new Guinea Equatorial Guinea Congo, DRC Eritrea Haiti Kenya	13 24 27 28 30 37 38 39 41 42 43 45 46 47 48

Food problem

The meaning of the global food problem is outstripping population growth compared to the growth in food production. As a result, the world is experiencing an increase in the number of malnourished and starving (annually from hunger, malnutrition and related illnesses die 40 million people). Growing human pressure on agricultural landscapes, deteriorating quality of food, the role of genetic engineering in solving the food problem.

On the Earth, there are belt of hunger, it stretches along the equator. As of tropical Africa is the epicenter of this belt. Countries with a high refractive starving Chad - 50%, Mozambique - 47%, Somalia - 45%, Uganda - 40%, Ethiopia - 39%.

Problems of resources

Energy and raw material problem - explains the explosive growth of consumption of fuel and raw materials. Only in the twentieth century in the world was produced and consumed fuel and raw materials more than ever before in human history. Been extracted from the earth 40% coal, 50% copper, 55% iron ore, 60% diamonds 75% oil, 80% gas. Science warns that at current energy consumption of proven fossil fuel reserves sufficient for about 150 years, including oil - for 35 years, gas - 45 years

The problems of human culture The problems of war

In the world of accumulated monstrous weapons of mass destruction. For every person on Earth has to many weapons, which is enough to destroy all life 20 times!

There came the realization that a nuclear war would be the end of life on Earth. The consequence of this war, as established scientists would be "nuclear winter."

    The concept of "nuclear winter" is as follows. As a result of nuclear explosions occur massive fires, accompanied by the release into atmosphere huge amounts of combustion products. Clouds composed of tiny particles of soot , absorb and scatter sunlight , causing blackout Earth's surface - " nuclear night ." As a result, violated the radiation balance of the planet, its surface temperature decreases to 15-20 ° C , leading to the death of all living things.

These are problems associated with the collision of cultures, ethnicities and religions. At the end of the twentieth century came a surge of nationalism and separatism, which destabilized the situation , but especially in the Balkans , the Caucasus, the Middle East, South Asia.

     An important factor of instability in the modern world has become a religious ( Islamic ) fundamentalism .