Twenty-one-year running means of global temperature (black line) and the STR intensity (red line). Both curves show anomalies relative to the 1961–1990 WMO reference period. (a) For global temperature, the y-axis is on the left, and for the intensity (in hPa) the y-axis is on the right. The dry decades (1935–1945 and 1997–2009) are indicated as pink bars. Similar curves are given in (b) for the detrended (using a linear trend computed from 1900 to 2009) global warming (black line) and the reversed sign of south-eastern Australian rainfall (red line).