This report explains how acidification, warming and de-oxygenation are affecting the oceans, and encourages policymakers to mitigate these stressors and prepare appropriate policy statements ahead of Rio+20. It was written with the aim of raising awareness of ocean issues at the COP17 in Durban, South Africa.

The report provides definitions of ocean acidification, warming and de-oxygenation. It includes a guide to ocean impacts predicted to occur this century unless greenhouse gas emissions are substantially reduced, and how these impacts will, in turn, affect the climate via feedback mechanisms. It also outlines recommendations for mitigation, adaptation and research to improve understanding of these stressors.