FIG. 49.25 Biodiversity at risk. A substantial proportion of vertebrate species has been classified as vulnerable (likely to become endangered in the absence of intervention), endangered (likely to become extinct in the absence of intervention), or critically endangered (very high risk of extinction in the wild). In the 21st century, these proportions are increasing year by year. Data from: Hogan, C. (2014). Endangered species. Retrieved http://www.eoearth.org/view/article/51cbedac7896bb431f69323a.
Data from: Hogan, C. (2014). Endangered species. Retrieved from http://www.eoearth.org/view/article/51cbedac7896bb431f69323a.