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Discussion Paper - Harvard Project on Climate Agreements, Belfer Center

Climate Sensitivity Uncertainty: When is Good News Bad?

| September 2015

Uncertainty about "climate sensitivity"—the impact on temperature of increased concentrations of greenhouse gases—grew from the IPCC's 4th to 5th Assessment Reports. The authors conclude that this "bad news" outweighs the "good news": a lower value for the bottom end of the range for temperature rise.