Recently, I was in Homer, Alaska, to talk about my book The End of Ice. Seconds after I had thanked those who brought me to the small University of Alaska campus there, overwhelmed with some mix of sadness, love and grief about my adopted state — and the planet generally — I wept.

I tried to speak but could only apologize and take a few moments to collect myself. It’s challenging for me, even now, to explain the wash of emotions and thoughts that suddenly swept over me as I stood at that podium on a warm, windy, rainy night on the southern Kenai Peninsula among a group ready to learn more about what was happening to our beloved Earth.