The authors of the document are the World Wide Fund for Nature (WWF) and the Zoological Society of London (ZSL).

It is indicated that the population of animals living in rivers and lakes, in particular, Amazon dolphins, has decreased most sharply.

"Populations of freshwater species (rivers, lakes, ponds or reservoirs) have decreased by 85%," the authors of the study insist.

However, some scientists question the methods of calculating the index on which the report is based. They argue that these methods can significantly exaggerate population declines, which, in their opinion, can affect public confidence in environmental issues.

In turn, the scientists who worked on the study emphasize that even if the report exaggerates the scale, the problem remains extremely serious, reports korrespondent.net.