“Let’s meet in Bodega Bay,” the seagrass researcher suggested. It wasn’t until I saw him waving from thigh-high waters that I realized he literally meant in the bay. Since that soggy first encounter, I’ve acquired both waterproof waders and a deep respect for an overlooked, underappreciated and vitally important marine habitat. Seagrass may, in fact, be a silent savior of the ocean—and the planet.