Hainan's life-saving forest has turned into a shrimp pond, which, like deforestation and land reclamation, has caused land desertification. The development of real estate and buildings has destroyed forest land, and the wastewater discharged from factories has made the original crystal clear river dirty and smelly.
2. 1930 smog event in the Maas Valley industrial zone in Belgium. There are many factories in this narrow valley, such as oil refinery, metal factory and glass factory. From February to 5th, 65438+/kloc-0, a strong inversion layer appeared over the valley, which prevented the smoke and dust emitted by the 1 3 chimney from spreading, and a large number of harmful gases accumulated in the near-earth atmosphere, causing serious harm to human body.
More than 60 people died in a week, among which the death rate of patients with heart disease and lung disease was the highest, and many livestock died. This is the earliest recorded public hazard event in this century.
Third, the photochemical smog incident in Los Angeles? 1943 Summer, Los Angeles, the west coast of the United States. 2.5 million cars in this city burn 1 100 tons of gasoline every day. The hydrocarbons produced by gasoline combustion react chemically under the irradiation of ultraviolet rays from the sun, forming light blue smoke, which makes most citizens in the city envious and have a headache.
Later, people called this pollution photochemical smog. There were two photochemical smog incidents in Los Angeles at 1955 and 1970. In the former, more than 400 people died of five senses poisoning and respiratory failure, while in the latter, three quarters of the people in the city were sick.
Fourthly, the Antarctic ozone hole was caused by excessive use of freon in the past and discharged into the air. There will be a lot of ultraviolet radiation on the earth, the incidence of skin cancer and the temperature of the earth will rise;
Red tides occur in many waters because domestic industrial wastewater enters the waters, which is rich in nitrogen and phosphorus, leading to eutrophication, which will lead to the death of fish and shrimp and damage people's health through biological enrichment. The destruction of American virgin forests is man-made, and many trees are cut down. Many animals have been displaced, and even some species have become extinct.
5. Excessive killing of natural enemies of pests, destruction of the food chain, resulting in forest pests and diseases; India once killed a large number of otters, which increased the number of sick fish and decreased the fish production. In Australia, where animal husbandry is developed, the dung beetle rescue case caused by cow dung covering grassland is more fresh. Of course, in the biological world, there are often several incentives.
6. Japan has the highest forest coverage rate in the world, reaching 69%. However, the 25 billion pairs of disposable chopsticks consumed every year are imported, and they also recycle the used chopsticks into pulp. Countries with extremely rich forest resources are "stingy" to the extent that they rely entirely on imports to solve the problem of disposable chopsticks production;
However, countries lacking in forest resources (China's forest coverage rate is only 13%, ranking 12 1 in the world) cut down a large number of trees to produce disposable chopsticks in exchange for foreign exchange, which really deserves reflection.
Lop Nur, the lost Fairy Lake, was once a very beautiful lake, but now it has disappeared and turned into a desert. This is a tragedy of man-made destruction of the ecological environment. This reportage warns the world with a powerful voice that it is necessary to establish the environmental awareness of the whole people and do a good job in ecological protection.
The main contents of nature protection:
First, prevent pollution.
Prevention and control of environmental pollution and chemical pollution caused by production and living activities, including prevention and control of industrial production waste water, waste gas, waste residue, dust, radioactive substances, noise, vibration, odor and electromagnetic microwave radiation, as well as harmful gas and liquid pollution caused by transportation activities.
Second, prevent damage.
Prevent environmental damage caused by construction and development activities, including pollution and damage caused by large-scale water conservancy projects, highway trunk lines, large ports and docks, airports and large-scale industrial projects, as well as damage and pollution caused by land reclamation activities around lakes, offshore oil fields, coastal zones and swamps.
Three. Nature protection
Protect the natural environment with special value, including providing effective protection for rare species and their living environment, special natural development relics, geological phenomena, landforms and landscapes. In addition, urban and rural planning, controlling soil erosion and desertification, planting trees, controlling population growth and distribution, and rationally allocating productive forces also belong to environmental protection.
Environmental protection has become one of the common actions and main tasks of governments and people all over the world. China declared environmental protection as a basic national policy, and formulated and promulgated a series of environmental protection laws and regulations to ensure the implementation of this basic national policy.