Under 1.5°C of warming, natural sedimentation rates are projected to outpace SLR (medium confidence), but ‘other feedbacks, such as landward migration of wetlands and the adaptation of infrastructure, remain important (medium confidence).’ SROCC (Bindoff et al., 2019a; Oppenheimer et al., 2019) Coastal ecosystems, including salt marshes, mangroves, vegetated dunes and sandy beaches, can build vertically and expand laterally in response to SLR, though this capacity varies across sites