[Illustrations, footnotes and references available in PDF version]
According to the IPCC, CO2-induced global warming will be net harmful to the world's marine species. One consequence of such harm, is a projected decline in ocean productivity. And in light of what the IPCC frequently refers to as the unprecedented modern rise in global temperature, it might reasonably be expected there should already be signs of a major negative impact on oceanic productivity. Yet the studies highlighted in this summary yield little evidence in support of the IPCC point of view.
It would appear that by enhancing the upwelling of cooler nutrient-rich waters along the eastern margins of major ocean basins, global warming helps to significantly enhance global-ocean primary productivity, which leads in turn to an increase in global-ocean secondary productivity, as represented by the global fish catch.