<P> Activities resulting in global climate change are expected to trigger droughts with a substantial impact on agriculture throughout the world, and especially in developing nations . Overall, global warming will result in increased world rainfall . Along with drought in some areas, flooding and erosion will increase in others . Paradoxically, some proposed solutions to global warming that focus on more active techniques, solar radiation management through the use of a space sunshade for one, may also carry with them increased chances of drought . </P> <P> As a drought persists, the conditions surrounding it gradually worsen and its impact on the local population gradually increases . People tend to define droughts in three main ways: </P> <Ol> <Li> Meteorological drought is brought about when there is a prolonged time with less than average precipitation . Meteorological drought usually precedes the other kinds of drought . </Li> <Li> Agricultural droughts affect crop production or the ecology of the range . This condition can also arise independently from any change in precipitation levels when soil conditions and erosion triggered by poorly planned agricultural endeavors cause a shortfall in water available to the crops . However, in a traditional drought, it is caused by an extended period of below average precipitation . </Li> <Li> Hydrological drought is brought about when the water reserves available in sources such as aquifers, lakes and reservoirs fall below the statistical average . Hydrological drought tends to show up more slowly because it involves stored water that is used but not replenished . Like an agricultural drought, this can be triggered by more than just a loss of rainfall . For instance, around 2007 Kazakhstan was awarded a large amount of money by the World Bank to restore water that had been diverted to other nations from the Aral Sea under Soviet rule . Similar circumstances also place their largest lake, Balkhash, at risk of completely drying out . </Li> </Ol> <Li> Meteorological drought is brought about when there is a prolonged time with less than average precipitation . Meteorological drought usually precedes the other kinds of drought . </Li>

What is the official definition of a drought
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