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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...
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Volcanoes Cool the Tropics, Say Researchers--But Global Warming May Have Helped Override Some Recent Eruptions(图)
Volcanoes the Tropics Global Warming Some Recent Eruptions
2009/12/10
Climate researchers have shown that big volcanic eruptions over the past 450 years have temporarily cooled weather in the tropics—but suggest that such effects may have been masked in the 20th century...