The tiny potato at the heart of one tribe’s fight against climate change

Last October, Aiyana James attended her first water potato harvest on the reservation of the Coeur d’Alene Tribe in northwestern Idaho. The weather was unusually cold, but she was determined to harvest her first water potatoes, a small wetland tuber that’s one of the tribe’s key traditional foods.

The smell of smoke and drying elk meat filled the air along the shore of Lake Coeur d’Alene, where the tribe set up food booths and educational stations. She waded into the frigid water barefoot to dig for the small tubers...