I have been an activist in the realm of “assisted migration,” working in behalf of one U.S. plant species (Torreya taxifolia). Your magazine was the first to tackle “assisted migration” and its attendant paradigm shift in conservation practice and ethics when you made it the cover story of the Jan-Mar 2007 issue: “When Worlds Collide,” by Douglas Fox. Now your article by Jim Robbins, “Between the Devil and the Deep Blue Sea,” places assisted migration advocacy within a much broader — and more frightening — context. In that article Reed Noss is quoted as reframing Florida Everglades conservation needs from an ethic of restoration to forward-looking “managed retreat.” That paradigm shift is crucially important for all conservationists and conservation organizations to begin discussing. I was heartened to read in Robbin’s article, too, that The Nature Conservancy seems to be wading into the new paradigm — surely a wrenching decision, given their investment in so many pocket-size and geographically static biodiversity preserves. I suspect that none of us are happy about giving up the old static view of nature and geography, nor of hoping that we can fully fend off global warming at the level of energy outputs. But give those views up we must, for the sake of biodiversity. Thank you for your excellent choice of issues to cover and writers to do the job.