What is Harm Reduction?

The concept of biodiversity Biodiversity refers to a stable ecological complex composed of a variety of living organisms (animals, plants, microorganisms) in a certain range.

Reduced biodiversity

Biodiversity refers to a stable ecological complex composed of a variety of living organisms (animals, plants, microorganisms) in a certain range. This diversity includes animal, plant, and microbial

The three main levels of recognized biodiversity are

China is one of the most biodiverse countries on the planet. Occupies a very unique position in the world. In 1990, biodiversity experts ranked China's biodiversity as the 8th richest country in the world. Among the countries in the northern hemisphere, China is the country with the most biodiversity. The characteristics of China's biodiversity are as follows:

1. Species are highly abundant China has more than 30,000 species of higher plants, second only to Brazil and

Biodiversity: The significance is mainly reflected in the value of biodiversity. For human beings, biodiversity has direct use value, indirect use value and potential use value.

(1) Direct value: Biology provides humans with food, fiber, construction and furniture materials, and other industrial materials. Biodiversity and

I. Analysis of the causes of harm to biodiversity

Reason 1: The population is growing rapidly

-The number of people has grown since the existence of humans. When productivity is lagging, population numbers are affected by natural factors such as drought,

Vigorously develop ecological engineering, pay attention to environmental protection while economic development, and can no longer follow the old routine of pollution first and then control. Instead, we should develop new technologies, improve resource utilization, develop new clean energy, reduce carbon dioxide emissions, and Due to local conditions, combining geographical features with economic development to truly achieve ecological economy and ecological development is conducive to maintaining biodiversity.

Before the emergence of human beings, the extinction of species was just as natural as the formation of species, and the two were in a relative equilibrium. It is estimated that the rate of natural extinction of species is about 90 species per 100 years. After the emergence of human beings, especially in the past 100 years, with the increase of population and the intensification of human activities, the rate of species extinction has greatly accelerated. Take mammals as an example: in the 17th century, there was an extinction every 5 years, and in the 20th century, there was an animal extinction every 2 years ( Xu Zaifu, 1991 ). As far as birds are concerned, in the early Pleistocene period, an average of one species was extinct every 83.3 years, while in modern times one bird is extinct from the earth every 2.6 years ( Xu Weishu, 1992 ). The rate of extinction of specialty birds living on some islands in the Indian Ocean and the Atlantic, from 1601-1699, 8 species, 1700-1799, 21 species, 1800-1899, 69 species, and 1900-1978, 63 species Species ( King, 1980 ). At present, biodiversity is being lost at an unprecedentedly high rate. According to estimates by foreign scientists, species are currently being lost 1000 times faster than humans before their natural extinction ( Wilson, 1988 ). Take birds as an example. Of the more than 9,000 bird species in the world, only 290 species were threatened with extinction to varying degrees before 1978, and now this number has risen to more than 1,000 species, accounting for approximately the total number of birds 11%. The United Nations Environment Programme estimates that 25% of the planet's total biodiversity will be in danger of extinction in the next 20-30 years. Between 1990 and 2020, the loss of species due to deforestation may account for 5-25% of the world's total species, that is, 15,000 to 50,000 species will be lost each year, or 40-140 species will be lost each day. The disappearance of a large number of species from the earth has caused widespread concern in the international community. How to take effective measures to rescue these species that are gradually extinct has become an important research content.