Essayist Lacy M. Johnson attends a funeral in Iceland for “Okjökull” — once a glacier 16 square kilometers in surface, and now “only a small patch of slushy gray ice.” In personifying shrinking masses of ice — key geographical features of the area, and the planet — officials hope to impress upon people the dire extent of climate change, and the need for humans to stop living in ways that threaten all life forms.