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5. Acid rain hazards

Acid rain to the impact of the ecological environment has become increasingly attracted worldwide attention. Acid rain can damage forests, acidification of lakes, endangering biology. Currently, the world's acid rain, mostly in Europe and North America, most acid rain occurred in developed countries, some developing countries, acid rain is also rapidly develop.

6. Species extinction factor to accelerate

On Earth is a precious human resources, biological diversity is the basis for the survival and development. However, the biological species on Earth is disappearing at an unprecedented rate.

7. Water Pollution Factors

According to the Global Environment Monitoring System Water Quality Monitoring Project showed that about 10% of global water pollution monitor, in this century, mankind's water consumption is increasing rapidly, while water pollution is also continuously expanding the scale, which formed a fresh water supply and demand of a contradiction. Thus, treatment of water pollution will be very to the urgent and important.