Endangered Salmon May Soon Swim Freely up a Maine River. But as the Climate Changes, a Comeback Isn’t Guaranteed.

On a recent canoe trip to the remote upper reaches of the Narraguagus River, Ellie Mason saw prime Atlantic salmon habitat everywhere. Though small, the river and its tributaries are some of the wildest in Maine, largely undeveloped and surrounded by forest. There are shady refuges for fish on hot s