ocean acidification, warming, local pollution and overfishing are acting together to increase the threat to coral reefs – so much so that three-quarters of the world’s reefs are at risk of severe decline.
The report also notes that previous mass extinction events have been associated with trends being observed now – disturbances of the carbon cycle, and acidification and hypoxia (depletion of oxygen) of seawater.
Levels of CO2 being absorbed by the oceans are already far greater than during the great extinction of marine species 55 million years ago (during the Paleocene-Eocene Thermal Maximum), it concludes.
The overfishing of our oceans  has been a problem for over 100 years and a known problem, that we continue to give too little attention to. Adding to that impacts of climate change and the state of ocean life is in trouble. The decision of our population to not deal with the causes of climate change will have very bad consequences. It is a shame we have so little caring about the consequences of our decisions. And even sadder that our “leaders” do such an appalling job of leading – instead they pander to selfish immediate gratification.
Related: Altered Oceans: the Crisis at Sea (2006)  – Unless We Take Decisive Action, Climate Change Will Ravage Our Planet  – Arctic System on Trajectory to New, Seasonally Ice-Free State (2005)