Characterizing half-a-degree difference: a review of methods for identifying regional climate responses to global warming targets

Rachel James, Richard Washington, Carl-Friedrich Schleussner, Joeri Rogelj & Declan Conway
The Paris Agreement long-term global temperature goal refers to two global warming levels: well below 2°C and 1.5°C above preindustrial. Regional climate signals at specific global warming levels, and especially the differences between 1.5°C and 2°C, are not well constrained, however. In particular, methodological challenges related to the assessment of such differences have received limited attention. This article reviews alternative approaches for identifying regional climate signals associated with global temperature limits, and evaluates the extent...
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