At present, the global extinction rate of animals and plants is 1000 times that of natural extinction, among which population growth, natural habitat destruction, deforestation, fires and climate change are the main reasons for the accelerated extinction. Human activities have significantly changed about 75% of the terrestrial environment and 66% of the marine environment, so about 1 million species of animals and plants are facing extinction. Nowadays, the world is in the sixth mass extinction.

Of the 93,579 species assessed globally, about 25% are facing threat of extinction. Among them, 41% of amphibians, 13% of birds, 7% of fish, 25% of mammals, 19% of reptiles, 36% of dicotyledons, 17% of monocotyledons, 40% of gymnosperms and 16% of ferns are at risk.

In contrast, the human population is increasing, As of June, 2022, the total global population of 238 countries is 7.898 billion. But in June 2019, the global population is only 7.579 billion. In other words, the world population has increased by more than 300 million in the past three years, despite the double impact of the epidemic and the economic downturn.