Times (UK): When lobsters swarm up the beach and octopuses try to clamber up fishing lines to get out of the water, you know that something has gone badly wrong in the ocean. Oxygen-starved dead zones have been appearing with increasing frequency around the world, with some 400 identified so far. While most are caused by sewage or fertiliser leaching into the ocean, a possible new driver has appeared in the northwest Pacific: climate change. Just as land animals need oxygen in the air to …