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Periodic Megadroughts Hit West Africa, Says Study--Global Warming Could Worsen Newly Seen Pattern（图）
Periodic Megadroughts West Africa Global Warming
2009/12/10
Researchers have developed the first year-by-year record of rainfall in sub-Saharan West Africa for the past 3,000 years, and identified a daunting pattern: a 30-to-60-year cycle of serious droughts t...