I IPCC:s klimatrapport som kom i höstas sägs det så här. Kap 3 s 47

Moreover, studies that have used more homogeneous records but that were consequently limited to rather short periods of 20 to 25 years in length, have reported no statistically significant trends or decreases in the global number of these systems (Kamahori et al., 2006; Klotzbach and Landsea, 2015). CMIP5 model simulations of the historical period have also not produced anthropogenically induced trends in very intense tropical cyclones (Bender et al., 2010; Knutson et al., 2010, 2013; Camargo, 2013; Christensen et al., 2013), consistent with the findings of Klotzbach and Landsea (2015). There is consequently low confidence in the larger number of studies reporting increasing trends in the global number of very intense cyclones. GCM projections of the changing attributes of tropical cyclones under high levels of greenhouse gas forcing.

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