Decay is the loss of animals within an ecological community. Within 40 years, the number of wild animals has decreased by 58% due to human activities, with this decrease expected to increase to 67% by 2020. The rate of decline of all types across the planet is at level exceeds the safety threshold. Animals in grasslands, savannas and shrublands are the worst affected areas, followed by forests and streams. Caused by human activities, including land reclamation for farming and trading activities.

Many people believe that only reversing the loss of biodiversity will benefit the ecosystem and ensure human life. There is consideration of redefining the current geological era as an Epoch (the era of humans/the Anthropocene) because of the enormous impact humans have had on the Earth, including those which creates fears of the sixth mass extinction in the planet's history. This can be certain about the actor's ability to support.

 Reason:

The main cause of animal decline is population growth and increasing human needs. Population growth, environmental pollution and global climate change are also indirect causes of wildlife decline. The decline in the number of individuals in wild animals is due to the significant impact of habitat encroachment, agricultural land confiscation, fishing, mining activities and many other human impacts. People.

On the other hand, animal populations are also affected by climate change, pollution and overexploitation of resources. Due to overexploitation by humans and climate change. Human activities have seriously damaged the oceans. People catch fish without allowing them to reproduce in time and destroy their breeding grounds. Many animals have been reduced and lost in quantity due to the destruction of their habitats, mainly due to human activities such as deforestation, construction of hydroelectric projects, and burning of forests for farming land. work

Animals are overexploited, such as hunting for human consumption. Not only habitat destruction, but poaching is also one of the main causes leading to a serious decline in the number of wild animals. Changes in ecosystem composition, such as when a species declines or becomes extinct, will lead to a decline in the species that rely on that species for food. The invasion of alien species can disrupt the ecological balance and reduce native animal populations.

If serious violations of the natural world are not restrained or stopped, not only will wild species be lost, but humans will also face the risk of extinction because of the world's biodiversity. The world is no longer within "safe limits" so it has the potential to threaten human existence. Plant and animal species are decreasing so rapidly that the world's biodiversity loss is no longer within "safe limits". The safe limit is thought to be a 10% reduction in species richness compared to the original number before humans colonized the land. However, some believe that a 70% reduction rate is still in the safe zone, even so, species richness drops by up to 88% once new species are introduced into the system.