Nearly half of animal species are declining.

According to a new study, 48% of animal species on Earth are currently experiencing population decline. This means a serious threat to biodiversity. The study looked at population densities of over 70,000 animals. Scientists explain that the evolution and even extinction of species is normal in itself, but now they are happening 100-1000 times faster than before. Researchers warn that humans could be causing the "sixth mass extinction" on Earth. The biodiversity crisis threatens the ecosystems on which life depends, the spread of disease and the stability of the global economy.