This finding, though based on uncertain reconstructions of past ENSO behaviour, is
entirely independent of previous
analyses confined to the restricted instrumental climate record...... such a trend would seem consistent with the response to the general increase in explosive volcanism during the fifteenth — nineteenth centuries in conjunction with reduced solar irradiance that is responsible for the millennial cooling trend of Northern Hemisphere mean
temperature before modern anthropogenic warming.
He presents an
entirely reasonable
analysis, stating little more than the obvious: that global warming has contributed to warmer ocean
temperatures, and that warmer ocean
temperatures affect evaporation and precipitation associated with hurricanes.