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The Intergovernmental Panel on Climate Change (IPCC) is a multi-country organization of the United Nations formed in 1988 to assess science related to climate change (IPCC 2024). In March 2023, the IPCC published its Sixth Assessment Report (AR6), its sixth assessment of climate change since its first in 1990 (IPCC 2023). IPCC (2023) and its supporting reports total almost 8,000 pages (Boehm and Schumer 2023). Hundreds of scientists from around the world worked to develop the IPCC reports, and thousands of scientists peer-reviewed the reports(Boehm and Schumer 2023; Houston 2022).A chapter of AR6 deals with the physical basis for climate change and includes sea level rise projections (Fox-Kemper et al. 2021). These projections were supported by updated projections of the contributions to sea level rise from Antarctica (Oppenheimer 2019) and Greenland (The IMBIE Team 2020). IPCC (2023) presents the final projections. Updated IPCC projections are not expected until its seventh assessment in 2029-2030. I will report on the sea level projections in AR6, and on an online tool that provides sea level rise projections for the world as a whole and at individual tide gauge locations around the world. The IPCC bases its projections on climate response to five scenarios that cover the range of possible future anthropogenic drivers of climate change. “These scenarios combine socio-economic assumptions, levels of climate mitigation, land use, and air pollution controls for aerosols” (Climate Neutral Group 2021). IPCC then determines levels of greenhouse gases(largely carbon dioxide) and temperatures to 2050 and 2100 using complex calculations that depend on how quickly humans curb greenhouse gas emissions. It estimates sea level rise using projected temperatures. Scenarios based on IPCC (2023) are summarized below.
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