Ocean warriors: The race to save seahorses, seagrass and flat oysters

As the UN Ocean Conference kicks off in Nice, we're focusing on seagrass meadows: vital climate allies that are among the least protected ecosystems on Earth. They store more CO2 per hectare than land forests and are home to vulnerable species such as seahorses. Yet nearly 30 percent of these underwater plants have already disappeared worldwide due to pollution, rising temperatures and harmful fishing techniques.