This publication on the risks posed by climate change on Large Marine Ecosystems (LMEs) shows that warming ocean waters as a result of climate change are threatening LMEs and thus the livelihoods of billions of people who are dependent on them. The Large Marine Ecosystem (LME) approach recommends a baseline of information at the LME management scale on changing states of productivity, fish and fisheries, pollution and ecosystem health, and socioeconomic and governance conditions. This information provides data to assess the extent of overfishing, nutrient over-enrichment, habitat loss and warming in LMEs around the globe, which can then inform issue prioritisation, strategic planning and adaptive management of LMEs towards sustainability. The report argues that there is an urgent need to invest in a green economy and mainstream climate change into sustainable development planning at all levels.