Cleveland's Cuyahoga River, once one of the dirtiest in the U.S., has seen a resurgence of life—both on the surface and below. In 1969 it was all but dead; now it has 70 species of fish.

4. Stir the butter beans and tomatoes into the vegetables, put the fish on top and return to the oven for 10–15 minutes or until the fish is just cooked. 5. Sprinkle with the chopped green fennel tops ...