"A marine heatwave in Western Australia in 2010 set off a massive “carbon bomb”, damaging the world’s largest seagrass meadow, releasing millions of tonnes of carbon that had been collected for thousands of years below the surface." https://amp.theguardian.com/environment/2018/mar/20/marine-heatwave-set-off-carbon-bomb-in-worlds-largest-seagrass-meadow