Recent global warming trends are inconsistent with very high climate sensitivity
Research published this week in Earth System Dynamics reports that the most sensitive climate models overestimate global warming during the last 50 years.
Three scientists from the University of Exeter studied the output of complex climate models and compared them to temperature observations since the 1970s.
Recent developments in cloud modeling have produced models that portray very large sensitivity to rising greenhouse gas concentrations.
A subset of models even showed that a doubling of CO2 could lead to over 5°C of warming, questioning whether the goals of the Paris agreement are achievable even if nations do everything they can.
The lead author of the study, Ph.D. candidate Femke Nijsse from the University of Exeter, said: "In evaluating the climate models we were able to exploit the fact that thanks to clean air regulation, air pollution in the form of climate-cooling aerosols have stopped increasing worldwide, allowing the greenhouse gas signal to dominate recent warming."
The amount of warming that occurs after CO2 concentrations in the atmosphere are doubled is called the equilibrium climate sensitivity.
The study found that based on the latest generation of climate models the equilibrium climate sensitivity is likely between 1.9 and 3.4 °C.
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