"The changes in probabilities are because of global warming," Emanuel said. Emanuel said he hurried the study to help Houston officials think about what conditions they should consider when they rebuild. Innovative techniquesTo do the study Emanuel had to use some innovative modelling techniques. "By the standards of the average climate during 1981–2000, Harvey's rainfall in Houston was 'biblical' in the sense that it likely occurred around once since the Old Testament was written," Emanuel's study said. He said Emanuel's results don't fit with other climate change model projections which do show higher rainfall totals but also show a decrease in the number of storms.

Source: CBC News November 14, 2017 18:45 UTC