The Dry Facts, Nature, Sept 2013.
Drought has wreaked havoc throughout history, destroying crops and causing famine and conflict. And it could be getting worse.
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Characterized by unusual and persistent dry weather, drought is caused by shifts in global weather patterns such as El Niño, but also increasingly by human-induced climate change. Identifying drought is difficult, however, so there is considerable uncertainty about whether it is getting any worse.
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