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A long-term retreat in snow and ice cover in the Northern Hemisphere is weakening the ability of these seasonal cloaks of white to reflect sunlight back into space and cool global climate. New research suggests that over the past 30 years, the cooling effect from this so-called cryosphere - essentially areas covered by snow and ice at least part of the year - appears to have weakened at more than twice the pace projected by global climate models. [Source: Christian Science Monitor]
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