Kelp forests will face moderate to high risk at temperatures above 1.5℃ global sea surface warming . 'Due to their low capacity to relocate and high sensitivity to warming, kelp forests are projected to experience higher frequency of mass mortality events as the exposure to extreme temperature rises .' 'Changes in ocean currents have facilitated the entry of tropical herbivorous fish into temperate kelp forests decreasing their distribution and abundance .' 'Kelp forests at low latitudes  will continue to retreat as a result of intensified extreme temperatures, and their low dispersal ability will elevate the risk of local extinction under RCP8.5 .'
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report