Seagrass beds are vital to the fight for a healthy climate. They suck up huge amounts of CO2, and store it for decades or centures in the thick mud the seagrass grows in. But the ocean is losing 7 percent of its seagrass habitats every year. We have to safeguard these underwater meadows, and it turns out one of the best ways to do so is by protecting sharks. Watch the video to find out why.