To better communicate deep uncertainty, WGI AR6 complements projections of likely global mean sea level change, driven by processes in which there is at least medium confidence, with projections that incorporate ice-sheet processes in which there is low confidence . The latter are accompanied by storylines to highlight the physical processes that would generate extreme outcomes . These low confidence projections and storylines are useful because the likelihood of high-end  global mean sea level  rise in the 21st century is difficult to determine but important to consider in coastal settings . High-end GMSL rise by 2100 could be caused by earlier-than-projected disintegration of marine ice shelves, the abrupt, widespread onset of marine ice sheet instability and marine ice cliff instability around Antarctica, or faster-than-projected changes in the surface mass balance and dynamical ice loss from Greenland . In a low-likelihood, high-impact storyline and a high CO2 emissions scenario, such processes could in combination contribute more than one additional metre of sea level rise by 2100 . Other hazards assessed in WGI AR6 that address similar aspects relevant for decision-making under deep uncertainty include drought , flood  and wildfire weather  , among others.
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report