It's tempting: You see a seashell on the beach and want to bring it home as a souvenir. What harm could taking one shell do? If you multiply that by the millions of people who visit our shores during the summer months, it can lead to massive destruction. When shells disappear from the beaches and oceans, it leads to increased beach erosion. When shells are on the beach, they help stabilize the sand, which lessens erosion. When the shells are gone, beaches go away, too. To help, admire the shells and leave them alone.