Standing in the empty rookeries of displaced Adelie penguins, I've caught the chill off broken, huge chunks of a receding ice shelf on the Antarctic Peninsula. In Alaska, I saw young black spruces growing higher than ever before on boreal hillsides. Near my home in the Pacific Northwest, I can see the ablation of glaciers. Comparing my photographs of great Andean glaciers to images 65 years old, I've witnessed the story of their wasting away. In the woods of Eastern North America, I walked through spring wildflowers and spotted incoming migrant songbirds, knowing many of them were increasingly early. Along the coasts, I have seen rising tides and heavy storms erode beaches.