Climate change: 2011 bodes more weather anomalies

Across the globe, leaders are waking up to the fact that global warming is a real threat. And its impact is palpable, often immediate—disasters and human suffering carried live on television or the Internet almost as they occur.
Last month, as the United States prepared for Christmas, its East Coast was buried under the avalanche of gale-force blizzards. This record snowfall was a reprise of...