Ken Nedimyer, Tavernier, Fla.
After his tropical-fish business exposed him firsthand to coral reef loss, Nedimyer discovered--while helping his daughter with a 4-H project--that it was possible to grow coral by placing cuttings on cement bases. That eventually led to his founding of the nonprofit Coral Restoration Foundation. "We had to learn all the lessons about farming coral," says Nedimyer. "And we're still learning." Nedimyer has replanted 13 reefs in the Florida Keys, which benefit grouper, snapper, snook, tarpon, and other sportfish. Recently, nursery-grown coral that he transplanted has successfully reproduced on its own--a first. --Mike Toth