A Reply to John L. Brooke’s “Malthus and the North Atlantic Oscillation”

In this continuation of his exchange with Brooke about Brooke’s big-picture model of climate change and human response, Harper argues for careful articulation of what kind of Malthusianism Brooke claims, or does not claim, for or against his model. Harper also challenges Brooke’s description of the paleoclimate known as the Roman Climate Optimum as a period dominated by a persistently positive mode of the North Atlantic Oscillation.