Harrison deploys "oyster mats"--sheets of mesh strewn with oyster shells--to
restore damaged oyster reefs in Mosquito Lagoon. The reefs provide habitat for
dozens of species of fish, including snapper, grouper, and sheepshead, says Dr.
Linda Walters, who has partnered with the Nature Conservancy on the project.
"Very few people are as doggedly determined as Greg is," Walters says. "He's
helped with every aspect of our restoration, from drilling shells in our backyard
to deploying mats." Harrison, who is a volunteer coordinator for the Coastal
Conservation Association, also organizes mat-making events at local schools.