Treeline elevation is linked to temperature  but may also be affected by water supply  and land management. A recent summary of treeline shifts worldwide found that 67% of studied alpine treelines had shifted upwards while 33% remained stable , and 88.8% of the 143 undisturbed alpine treelines across the Northern Hemisphere had shifted upwards . Since AR5, new evidence of shifting treeline ecotones has emerged for a wide variety of species in different locations, including in Siberia , various parts of the Ural Mountains , in the Canadian Rocky Mountains  and the Himalaya . Recent studies of treelines that have not or hardly shifted include those in the Himalaya , eastern Tibetan Plateau  and the Andes . Migration rates are not proceeding as fast as warming rates, implying other processes also limit treeline ecotone response .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report