This RFC addresses the potential for increased damage to or irreversible loss of a wide range of physical, biological and human systems that are unique  and are threatened by future changes in climate . The specific examples of such systems given in previous IPCC assessment reports has remained broadly consistent, with AR4 including 'coral reefs, tropical glaciers, endangered species, unique ecosystems, biodiversity hotspots, small island states, and indigenous communities' , AR5 including 'a wide range of physical, biological, and human systems that are restricted to relatively narrow geographical ranges' and 'are threatened by future changes in climate' , and SR15 Chapter 3 including 'ecological and human systems that have restricted geographic ranges constrained by climate related conditions and have high endemism or other distinctive properties. Examples include coral reefs, the Arctic and its Indigenous People, mountain glaciers and biodiversity hotspots'. In this cycle, we retain the definition used in SR15 as most explicit and inclusive of the previous definitions.
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report