Nine percent of the Western Hemisphere’s mammals—and up to 40 percent in some regions—may not be able to outpace climate change. “I think it’s important to point out that in the past when climates have changed—between glacial and interglacial periods when species ranges contracted and expanded—the landscape wasn’t covered with agricultural fields, four-lane highways and parking lots, so species could move much more freely across the landscape,” says Joshua Lawler, associate professor of environmental and forest sciences at University of…


