“I’m still doing all these things because I’m a father and a grandfather of 10,” he said. “I never thought about this kind of thing in the 1920s and 30s.”

Now almost a century later, Bottoms said fossil fuel development has led to some very destructive trends. “This could be the end of things for a lot of things,” he said. “You know frogs? Where the hell are all the frogs? They’re a good indication of what’s happening. A lot of things are disappearing.”