These Japanese volunteers are planting seagrass to fight climate change

Around 100 volunteers gather on beaches in Yokohama to plant eelgrass seedlings beneath the water. The shallow waters around Tokyo Bay used to teem with eelgrass, a type of seagrass. But as Japan’s 2 largest cities - Tokyo and Yokohama - developed nearby, the eelgrass died out. The volunteers have been working for more than 2 decades, but they face an uphill struggle.