“We cannot casually accept the loss of oaks without also accepting the loss of thousands of other plants and animals that depend on them. Oak declines in the United Kingdom, for example, threaten the survival of some 2,300 other species (Mitchell et al. 2019). Fortunately, there is no reason why we should accept the loss of oaks as inevitable; there is no trick to restoring oak populations, and no shortage of places in which to restore them. If you were to add up the amount of land in various types of built landscapes that is not dedicated to agriculture—suburban developments, urban parks, golf courses, mine reclamation sites, and so forth—it would total 603 million acres, a full 33% of our lower 48 states. We have not targeted these places for conservation in the past, but that was back when our conservation model was based on the notion that humans and their tailings were here and nature was someplace else. That model of mutual exclusion has failed us dismally; there simply are not enough untrammeled places left to sustain the natural world that until now has sustained us. Our only option, then, is to find ways to coexist with other species. That’s right, we must construct ecosystems that contain all their functional parts right where humans abound.”