The Living Planet Index (LPI) now tracks the abundance of almost 21,000 populations of mammals, birds, fish, reptiles, and amphibians around the world. Using the data from 20,811 populations of 4,392 species, the 2020 global LPI shows an average 68% decline in monitored populations between 1970 and 2016 (range: -73% to -62%). The percentage change in the index doesn't represent the number of individual animals lost but reflects the average proportional change in animal population sizes tracked over 46 years.
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