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Caio A. S. Coelho and Lisa Goddard

1. Introduction The majority of drought-related hazards and the attendant economic losses and mortality risks reside in the tropics ( Dilley et al. 2005 ). Changes in climate variability, including more frequent and damaging extreme events such as drought, is one of many anticipated impacts of climate change. Estimating how climate variability may change in a warmer world, and how that variability intersects with more slowly evolving climate change, is vitally important to climate risk

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Rachel R. McCrary and David A. Randall

1. Introduction The risk of future long-term drought (a dry period that exhibits below-average annual precipitation for 5 yr or longer) is one of the biggest concerns facing the Great Plains region of the United States (defined here as the region bounded by 30°–50°N, 95°–105°W). Droughts have serious social, economic, and environmental consequences and can negatively impact surface and groundwater supplies, water quality, agriculture and rangeland productivity, natural ecosystems, and

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