The
table that
accompanies the above passage from the IPCC's report, captioned «Extreme weather and climate events: global - scale assessment of recent observed
changes, human contribution to the
changes, and projected further
changes for the early (2016 — 2035) and late (2081 — 2100) 21 st century `'» has the following entries for «Increases in intensity and / or duration of drought»: under
changes observed since 1950, «low confidence on a global scale, likely
changes in some regions `'» [emphasis added]; and under projected
changes for the late 21 st century, «likely (medium confidence) on a regional to global scale».
The climate
changes have been simulated by seven coupled atmosphere - ocean general circulation models (AOGCMs; see
Table 1 of the
accompanying report), the greenhouse gas and aerosol forcing being inferred from the SRES emission scenarios A1FI, A2, B1 and B2.