Coastal ecosystems are better than tropical rainforests when it comes to trapping carbon, Newsroom reveals. “Oceans have taken about 93% of the heat in the atmosphere and they have absorbed about 30% of the carbon dioxide,” says Dr Sarah Seabrook, a microbial ecologist. But absorbing too much carbon dioxide has a cost – it makes the water too acidic and that’s been causing problems. This year, for the first time, for the first time, oceans have been formally included in UN climate change negotiation processes.