Drought is not a new problem. People and ecosystems have been dealing with it for millennia; some successfully, and others not so successfully. Scientists have attributed past migrations to wetter regions—and even the decline of entire civilizations—to extremely dry periods lasting for several years or decades. A 1998 World Bank Report by Benson and Clay shows how the 1991-1992 Sub-Saharan African drought affected entire national economies, costing millions of dollars and thousands of jobs.
While people are largely well adapted to the ‘natural’ climate variability of their region (of which drought is one half of the equation, and abnormally wet periods the other), droughts can pose very serious risks when their severity exceeds expected levels, or when they strike in areas which are not used to coping with them. And this is likely to happen more frequently with climate change.