On July 15, Teng Fei research group of nstitute of Energy, Environment and Economy, Tsinghua University published a paper entitled Climate module disparities explain inconsistent estimates of the social cost of carbon in integrated assessment models on One Earth.
The social cost of carbon (SCC) determines the quantifiable cost (in monetary value) of emitting CO2 and has been employed by policy makers to evaluate the benefits of climate mitigation against the costs of cutting emissions. SCC is generally estimated using integrated assessment models (IAMs), primarily the DICE, FUND, and PAGE models.
However, these models often report different SCC estimates. Inconsistent SCCs can lead to over-/underestimation of the costs and benefits of emission reduction, further undermining the effectiveness of climate policies.
The reasons behind such inconsistent SCCs, however, remain unclear.
Here, the researchers quantitatively decompose two core components of IAMs, climate modules and damage functions, and find that the core reason for SCC disparities lies in differences in climate modules.
These differences explain 60%–95% of SCC variations. SCC estimates are more consistent when DICE/FUND/PAGE IAMs are coupled with a reduced-complexity climate module.
The study highlights the importance of considering a common modeling framework by synthesizing state-of-the-art information on climate science to provide more consistent science-based advice to policy makers.
The link of this article:https://doi.org/10.1016/j.oneear.2022.06.005