第1个回答 2008-03-15
Now the Earth's environment:
Soil destruction At present, there are 110 countries of fertile arable land in the lower level. In Africa, Asia and Latin America, due to the disappearance of forest vegetation, and the over-exploitation of farmland and pastures of overgrazing, soil erosion is very serious.
Air Pollution
Air pollution problem is the problem of acid rain. Previously, only relates to the problem of acid rain in Europe and North America the old industrial countries. But now, Asia and Latin America, high-speed economic development in some areas has also been a violation of acid rain. Air pollution also disrupt the normal functioning of ecosystems, damage to accelerate housing, resulting in abnormal climate changes.
Freshwater under threat
In developing countries, 80% -90% of the disease and 1 / 3 more of the causes of deaths are related to bacterial infection or by chemical pollution of the water. Now, every day 25,000 men, women and children dying from water-borne diseases.
Climate change and energy waste
Warming a serious threat to the whole of mankind. According to a representative of the 2,500 experts estimate that the sea level will be increased, the temperature increase will also agriculture and ecosystems seriously affected.
Reduction in forest area
In the past few hundred years ago, the temperate countries in the region lost most of the forest. In recent decades, the tropical forest area countries in the region to reduce the situation is also very serious. According to the current rate of decrease of forest area, 40 years later, some Southeast Asian countries on the Nanjian forest.
Reduce biodiversity
Because of urbanization, agricultural development, deforestation and environmental pollution, the presence of natural areas is becoming increasingly smaller, which led to the extinction of thousands of species.
Chemical pollution
Industry of hundreds of millions of compounds present in the air, soil, water, plants, animals and humans. Even as the final major on the planet natural ecosystem has been contaminated ice.
Chaotic urbanization
The population explosion and the deterioration of agricultural land, poverty, promote third world to the millions of peasants have left their rural areas, gathered in the city slums. With the advent of the new century, and some major cities in the living conditions will deteriorate further.
The over-exploitation of marine and coastal zone pollution
Because of over-fishing, marine fisheries resources is to reduce the appalling speed. Therefore, many seafood protein intake on the living of the poor face the threat of starvation.
Polar ozone hole
Each spring in the Earth's two polar ozone hole will form over the Arctic ozone loss of 20% -30%, the Antarctic ozone loss of more than 50 percent.
第2个回答 2008-03-15
Now Earth's environment:
the soil is destructed present, some 110 country's arable land's fertile degree is reducing. In Africa, Asia and Latin America, as a result of forest cover plant's vanishing, the farming excessive development and pasture over-grazing, the soil disintegration situation are very serious.
Air pollution
the air pollution question is also the acid rain question. Before, the acid rain question only involved to European and North America's old industrialized country. But now, Asian and Latin America's economical high speed development's some areas have also received the acid rain violation. The air pollution also disrupts the ecosystem the normal work, accelerates the house the damage, causes the climate unusual change.
The fresh water receives threatens
in the developing country, 80%-90% diseases and 1/3 above the dead's cause of death with concerns the bacterial infection or chemical contamination's water. Now, every day some 25,000 men and the women and children die in adopt the water-borne infection disease.
The climatic change and the energy waste
the greenhouse effect threaten seriously entire humanity. According to 2500 has the representative expert to estimate that the sea level will elevate, the temperature will elevate also brings the serious influence to the agriculture and the ecosystem.
The wooded area reduced
in the past several hundred years, the temperate zone area country has lost the majority of forests. Since recently several dozens years, the tropics area country wooded area has reduced the situation is also very serious. Speed which reduces according to the present this kind of wooded area, 40 years later, some Southeast Asian country on difficult to see the forest.
The biological variety reduced
as a result of the urbanization, the agricultural development, the forest reduction and the environmental pollution, the biological existence natural region becomes getting smaller, this has caused thousands of species vanishing.
Chemical contamination
the industry brings several million kind of compound exist in the air, the soil, the water, the plant, the animal and the human body. Even if the final large-scale natural ecosystem's ice cap has also been polluted as the Earth on.
Chaotic urbanized
population detonation and agricultural land worsening, poor, urges the farmer who the third world million counts to leave the countryside, gathers in the big urban slum. Along with the new century's arrival, in some big city's living condition will worsen further.
Sea overdevelopment and littoral pollution
because fishes for excessively, the sea fishery resources are reducing by the fearful speed. Therefore, many depend on the ingestion marine products protein for the fresh poor person faced with threat of hunger.
the polar region ozone layer is empty
spring, will form the ozone layer in Earth's two polar region's sky to be empty every year, North Pole's ozone layer will lose 20%-30%, South Pole's ozone layer will lose above 50%.本回答被提问者采纳