WHAT LIES AHEAD FOR THE PLANET?
THE SAYING IS SO WELL KNOWN that most of us can finish the sentence: Those who cannot remember the past … … are condemned to repeat it. It’s a fitting reminder this month as we mark the 50th anniversary of Earth Day. For the occasion, we’ve created the first ever “flip” issue of National Geographic—essentially two magazines in one—to revisit environmental milestones of the past half century and to look ahead at the world our descendants will inhabit in 2070, on Earth Day’s 100th anniversary. Two scenarios emerge. On the magazine cover just before this page, there’s a verdant Earth. Welcome to the optimistic view of writer Emma Marris, who sees a world that is changed—we cannot undo some damage we have done—but one in which technologies will be harnessed to “feed a…