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Figure 1: Conservation status of lands in the continental United States. Gap status 1 - areas with permanent protection. Gap status 2 - areas with permanent protection, but management that degrades natural communities is allows. Gap status 3 - areas with permanent protection but subject to resource extraction. Gap status 4 - areas without known public or private mandates for protection. (From [1]).

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Figure 2: The relationship between human population density and species richness in Australia (upper) and the United States (lower) (from [3]).

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Figure 3: Percent of overlap between conservation targets and human population density under the two scenarios (a) and the number of grid cells included in the conservation targets under the two scenarios (from [3]).

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