October, 2, 2019 — The 51st session of the Intergovernmental Panel on Climate Change (IPCC 51) adopted the Summary for Policymakers (SPM) of the Special Report on the Ocean and Cryosphere in a Changing Climate (SROCC), and accepted the underlying report. The SROCC assesses the latest scientific knowledge about the physical science basis for, and impacts of, climate change on ocean, coastal, polar and mountain ecosystems, and the human communities that depend on them.
The report also evaluates their vulnerabilities and adaptation capacity, as well as options for achieving climate-resilient development pathways. The report’s SPM, which the Panel approved line-by-line, aims to tease out some of the key findings of the longer report in such a way that policymakers can easily comprehend and use them.
The Earth Negotiations Bulletin highlights that oceans and ice are an “integral and dynamic part of the earth’s climate systems,” as they cover more than 80% of the earth’s surface. The report underscores the urgency of prioritizing “timely, ambitious and coordinated action” to address “unprecedented” and enduring changes in the ocean and cryosphere. It also describes the benefits of ambitious and effective adaptation for sustainable development, and the escalating costs and risks of delayed action.
According to the report, global warming has already reached 1°C above preindustrial levels, with: profound consequences for ecosystems and people; a warmer, more acidic and less productive ocean; melting glaciers and ice sheets causing increased sea level rise; and coastal extreme events becoming more severe.
The global ocean, the report notes, has warmed unabated since 1970 and has taken up more than 90% of the excess heat in the climate system, with consequences now visible in increased ocean acidification, stratification and loss of oxygen. Speaking at the press conference that launched the report to the public, IPCC Vice-Chair Ko Barrett said, “Water is the lifeblood of the planet,” and the world’s ocean and cryosphere have been “taking the heat” from climate change for decades, with “sweeping and severe” consequences for nature and humanity. She warned that changes to the ocean and cryosphere are forcing people from low-lying coastal cities to Arctic communities to “fundamentally alter their ways of life.”