The Indian River Lagoon, a shallow estuary that stretches for 156 miles along Florida’s eastern coast, is suffering from the activities of human society. Poor water quality and toxic algal blooms have resulted in fish kills, manatee and dolphin die-offs and takeovers by invasive species. But the humans who live here have needs, too: the eastern side of the lagoon is buffered by a stretch of barrier islands that are critical to Florida’s economy, tourism and agriculture, as well as for launching NASA missions into space.