Not long ago, I was back at Harvard, speaking with students about careers in climate and conservation. After the event, many of them came up to me, full of ideas, asking for advice, taking my card, promising to follow up. And, to my delight, they did. As we talked, I could see my old dorm in the distance. It reminded me how much my life has been shaped by a few defining places. Some I passed through. Others are where a profound change took shape.