Nine months ago, I was struck by an intriguing anomaly. Media usually reflects society. If you look back at the history of journalism, big geopolitical shifts or cultural changes tend to throw up one or two media properties that epitomize that moment in time. Many would argue that climate change—and the transformation it is prompting in politics, business, technology and human behavior around the world—is the biggest shift of our time. And yet there is no media brand that has become a symbol of that revolution.