Marine environmental problems include two aspects: first, marine pollution, that is, pollutants enter the ocean, which exceeds the self-purification ability of the ocean; The second is the destruction of marine ecology, that is, under the influence of various human and natural factors, the marine ecological environment is destroyed. (1) Marine Pollution Most marine pollutants are produced on land. Coastal activities such as waste dumping and port engineering construction also discharge pollutants into coastal waters. Pollutants enter the ocean, polluting the marine environment, endangering marine life and even endangering human health. Waste discharged from industrial production is the main source of marine pollutants, which is concentrated near large ports and industrial cities. 1953- 1970 mercury pollution occurred in Minamata Bay, Kyushu Island, Japan, because the factory discharged mercury-containing waste during the production of organic products. These harmful substances are gradually enriched in fish and shellfish after flowing into the ocean. Finally 100 people were seriously poisoned and died one after another. The cooling water discharged from nuclear power plants and factories, with high water temperature, often affects marine life when it flows into estuaries or the sea. Pesticides applied to farmland flow into rivers with rainwater, or deposit near estuaries with soil particles, and finally enter the ocean. Occasionally, accidents occur on offshore oil platforms and oil tankers, resulting in oil leakage and overflow, resulting in marine pollution. (2) The destruction of marine ecology is not only caused by marine pollution, but also by human production activities, such as engineering construction and fisheries (reclamation and overfishing). ), as well as changes in the natural environment such as global warming and sea level rise, will destroy and change the marine ecological environment. Over-fishing of some marine organisms by human beings has led to a decline in the quantity and quality of marine biological resources, and some species are on the verge of extinction. Some coastal engineering construction and reclamation lack scientific demonstration, which destroys the coastal environment and coastal ecosystem. At present, marine development activities still lack comprehensive and long-term planning, and the comprehensive benefits are poor. Oil pollution and the monitoring and prevention of ships on coastal industrial production and shipping routes are the main sources of oil pollution. Therefore, oil pollution areas are concentrated in coastal waters and along sea lanes. Accidental oil spill has attracted public attention because of obvious pollution signs, concentrated pollutants and serious harm, and is also the focus of pollution control at present. The birth of the United Nations Convention on the Law of the Sea has taken an important step towards establishing a new international legal order. However, because the United Nations Convention on the Law of the Sea should take into account the interests and requirements of all countries, there are still many imperfections and ambiguities. Therefore, in the process of implementation, some new contradictions and problems will inevitably appear. For example, in a closed and semi-closed sea area, the 200-nautical-mile exclusive economic zone advocated by neighboring countries may overlap, and some issues such as island sovereignty disputes and fishery resource allocation may become new factors of tension between neighboring countries and even lead to international conflicts. Therefore, the delimitation of maritime areas and maritime rights and interests under the jurisdiction of neighboring countries needs to be resolved fairly and reasonably by the countries concerned in the spirit of friendly consultation. A tree can absorb a lot of carbon dioxide and other harmful gases every day, releasing the amount of oxygen equivalent to the amount that a factory worker breathes every day. Flowers and plants can absorb noise. If you plant a flower lawn, you can greatly reduce noise pollution. This shows the importance of plants to human beings. But some people don't know this yet. Whenever I see the lawn trampled by those people and the placard that loves flowers and plants that has been kicked down, my heart is like a knife cut, which is very uncomfortable. If I lose flowers and trees, I can't imagine what the world would be like! In the third grade, I learned the text "A Small Village", which is about a beautiful small village. Because people cut down trees excessively, the land was exposed and the village was washed away by the flood. What a terrible thing it is! Will this happen again in our city? Animals are friends of human beings and wealth of society, so we should cherish them. I know from Lingnan Youth Daily and Modern Pupils Daily that the American cheetah has long since died. The fierce horse elephant has died in the glacier; Saber-toothed tigers have long been extinct; European Thunderbirds are on the verge of extinction; Whales are dying; African elephants are forced to be endangered. From now on, start from me, eat less wild animals and stop hunters from killing animals. I remember that SARS spread in 2003 because people ate civet cats and the coronavirus mutated. I got the ozone layer from the internet, which is called the umbrella of the earth, because it can block most ultraviolet rays. Without the ozone layer, the earth would be burnt in an instant. Because people use a lot of chemicals, a big hole has appeared over the South Pole. Fresh water is also precious. According to TV news reports, 70% of the water in the world belongs to salt water and cannot be drunk. According to statistics, one in three people will be short of water, not to mention the salt water converter has not been invented. The sound of running water must be that someone didn't tighten the tap. Saving water is just lip service. No one remembers those unconscious people washing their hands without turning off the tap, so the fresh water ran away in vain. In short, environmental protection can no longer be empty talk, but should focus on practical actions. Everyone should use our hands to protect our beautiful and fragile earth.