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Abstract:
The concept of Earth's Equilibrium Climate Sensitivity (ECS) is
reviewed. A particular problem in quantifying plausible bounds for ECS
has been how to account for all of the diverse lines of relevant
scientific evidence. It is argued that developing and refuting physical
storylines (hypotheses) for values outside any proposed range has the
potential to better constrain these bounds and to help articulate the
science needed to narrow the range further. A careful reassessment of
all important lines of evidence supporting these storylines, their
limitations, and the assumptions required to combine them is therefore
required urgently
