δ^2(Fellow species exterminated) / δ(time)^2

Global patterns of net change in overall extinction risk across birds, mammals, and amphibians mapped as average number of genuine Red List category changes per cell per year. Purple corresponds to net deterioration (i.e., net increase in extinction risk) in that cell; green, net improvement (i.e., decrease in extinction risk); white, no change. The uniform pattern of improvement at sea is driven by improvements of migratory marine mammals with cosmopolitan distributions (e.g., the humpback whale). Note that the intensity of improvements never matches the intensity of deteriorations.

Hoffmann et al. (2010), ‘The Impact of Conservation on the Status of the World’s Vertebrates’, Science 330 (6010), p. 1503-1509.

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