Which species will be inscribed on the last gravestone in the world's extinct animal cemetery?

Throughout the history of the development of the universe, we find that the extinction of a species is not a rare event. In the long history of the past 450 million years, the earth has experienced five historical periods in which the species and number of organisms have declined sharply. These events are called "five mass extinctions". The most famous is the fifth extinction, 96% of marine life and 75% of land life suffered mass extinction, including the dinosaurs that dominated the world for 140 million years. Due to the extinction of dinosaurs, mammals also began to multiply, and primitive humans began to multiply.

Time flies, white horses pass by, and time comes to the 21st century, when human beings have already stood at the top of the food chain. The rise of the Industrial Revolution in the 1760s promoted the continuous prosperity of human society and economic development. But behind the rapid economic development is the huge price of the extinction of natural biological species at a rate of thousands of times! In the "Global Biodiversity Assessment Report" released by the United Nations in 2019, it is pointed out that nature is in an unprecedented decline, and experts say that the sixth mass extinction may have quietly come.

The extinction of species is a natural phenomenon, but the excessive frequency of human activities has led to the acceleration of "malignant extinction". Such as: over-exploitation of resources, massive soil loss, global warming, melting of Arctic glaciers, mass extinction of species, etc.

Chinese sturgeon is a kind of fish unique to China. It belongs to the same era as dinosaurs. It is known as a living fossil. It is one of the oldest vertebrates on earth and the oldest rare fish. However, the current number of Chinese sturgeon has decreased sharply, not only due to natural factors but also human factors. The Chinese sturgeon is migratory, and their reproduction process will swim from the sea to the river. Every summer, the adult Chinese sturgeon will enter the mouth of the Yangtze River from the East China Sea, and travel up the river after more than a year until the second year. In autumn, they arrive at their breeding sites: the upper reaches of the Yangtze River and the Jinsha River, where they mate and spawn, and then go downstream and return to the sea.

However, since 1981, the construction and operation of Yangtze River dams, such as the Three Gorges Dam and the Gezhou Dam, not only blocked the original passage of Chinese sturgeon, but also caused the water temperature in the spawning grounds of Chinese sturgeon to rise significantly. The reproduction of Chinese sturgeon is extremely sensitive to water temperature and needs to be kept between 18°C ​​and 20°C. The rise of water temperature means that the reproduction of Chinese sturgeon will be greatly threatened, which is also a fatal blow to this population.

Some data show that before the construction of the Gezhou Dam in 1981, the number of Chinese sturgeon in the Yangtze River stabilized at more than 1,700, but in 2015 there were only 156 remaining, and in 2010, the Chinese sturgeon was listed as a critically endangered species.

There is a "cemetery of extinct animals in the world" in Nanhaizi Milu Garden in Beijing, where the tombstones of various birds and beasts that have been extinct in the past 300 years are lined up. It is worth noting that the arrangement of the tombstones is similar to dominoes. A tombstone will fall, the common fool dove went extinct in 1680, the elephant bird went extinct in 1700, the Stella manatee went extinct in 1769, the moa went extinct after 1800, and the white-footed Australian wood rat went extinct in the early 19th century... . The number of Bone Nomi cards fell more and more, and the extinction of human beings seems to be imminent.

As the classic line in "The Wandering Earth" said: Initially, no one cared about the disaster. This is nothing more than a wildfire, a drought, the extinction of a species, the disappearance of a city. Until everyone has a stake in this disaster.