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I think droughts from rainfall are decreasing.Question-are droughts increasing or decreasing over the past 50 years?
Precipitation measurements and trends in the twentieth century
on the other side of the coin, our demand for water has increased faster than the slight increase in rainfall,Precipitation gauge data indicate that global land precipitation (excluding Antarctica) has increased by about 9 mm over the twentieth century (a trend of 0.89 mm/decade), which is relatively small compared with interannual and multi-decadal variability.
the result is less available water.
The cause is certainly Human activity.