Man's destruction of the earth

The concentration and toxicity of pollutants will naturally decrease, which is called environmental self-purification. If the discharged substances exceed the self-purification capacity of the environment, the environmental quality will change adversely, endangering human health and survival, thus leading to environmental pollution.

The carbon dioxide concentration of the earth has reached a record high.

But the overall situation is deteriorating rapidly. If the earth's temperature rises by 5 to 6 degrees Celsius in the future and the polar ice caps disappear, the earth will not be as suitable for human beings and large mammals as it is now.

The urban population has increased sevenfold.

The population problem is due to the rapid change of population in quantity, structure and distribution, which leads to the contradiction between population and economy, society, resources and environment.

4. Biodiversity is decreasing.

Due to urbanization, agricultural development, forest reduction and environmental pollution, the natural area has become smaller and smaller, leading to the extinction of thousands of species. Because the extinction of some species will lead to the disappearance of many molecules that can be used to make new drugs, and also lead to the disappearance of many genes that can help crops overcome bad weather, and even lead to new plagues.

5. The forest area has decreased.

In recent decades, the forest area in tropical countries has also been seriously reduced. In 1980- 1990,1500,000 hectares of forest disappeared in the world. According to the current rate of forest area reduction, 40 years later, some Southeast Asian countries will not see a tree.

6. Freshwater resources are threatened.

According to experts' estimation, from the beginning of the next century, a quarter of the world will be short of water for a long time. Please remember that we can't make water, we can only try to protect it.

7. Chemical pollution

Millions of compounds brought by industry exist in air, soil, water, plants, animals and human body. Even the ice sheet, the last large natural ecosystem on earth, has been polluted. Those organic compounds, heavy metals and toxic products are concentrated in the whole food chain, which will eventually threaten the health of animals and plants, lead to cancer and weaken soil fertility.

Baidu Encyclopedia-Ecological Destruction