Over the past 20 years, the world's largest seagrass restoration project has shown that damaged marine habitats can be restored. Thanks to an army of volunteers and 75 million seeds, eelgrass now blankets 9,000 acres of coastal bays of Virginia's Eastern Shore. Seagrass makes up about 10 percent of the ocean's carbon storage and is home to marine life. It boosts commercial fishing, purifies water and protects coastlines but is threatened by coastal development and rising ocean temperatures. The project now aims to fund more restoration by selling carbon credits and to restore all the bays that were stripped of seagrass by disease in the 1930s.