New York Times: Increased emissions of carbon dioxide affect more than the atmosphere. Much of the CO2 is absorbed by the oceans, causing them to become more acidic. Recent research has looked at the impact of the acidification on corals and other small calcifying organisms. But increasing CO2, coupled with gradual warming of the oceans, may have other effects, and may affect bigger creatures, because there will be less oxygen at the surface and deep oxygen-poor zones will expand vertically. A …