Even if the northern ocean increases in productivity in the future, it will barely be enough to maintain current levels of fish consumption. (all-creatures.org)
Overall, precipitation over land increases by about 5 %, while precipitation over ocean increases 4 %, but with regional changes of both signs. (ipcc.ch)
What happens when the world moves into a warm, interglacial period isn't certain, but in 2009, a paper published in Science by researchers found that upwelling in the Southern Ocean increased as the last ice age waned, correlated to a rapid rise in atmospheric carbon dioxide. (sciencemag.org)