This map shows the average direction 2900 mammals, birds, and amphibians need to move to track hospitable climates as they shift across the landscape.Only 41 percent of the natural land area in the United States retains enough connectivity to facilitate species tracking their preferred climate conditions as the global climate changes. As part of that study, scientists modeled the distribution and habitat needs of 2,903 vertebrate species in the Western hemisphere against land use and projected climate patterns.Scientists combines global circulation model projections, species distribution modeling, and electronic circuit theory.Via nature.org