Despite these scientific advances, SCC estimates vary widely in the literature. Technical issues with past and current modelling  and the challenge of comparability across methodologies imply that many estimates are not robust . Also, as a result, the issue of directional bias of past estimates remains unsettled. Better representation of uncertainty in methods can improve robustness, while detailed methodology assessment and comparison will help define the relative biases of methods .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report