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Kudzu, the invasive plant spreading across the southern U.S. at a rate of more than 120,000 acres a year, is drawing huge amounts of carbon out of the soil as it grows, researchers say. Kudzu-infested forests give up as much as a third of their soil-sequestered carbon, totaling up to 4.8 million tons of carbon a year

Greenpeace is struggling to make the public impression it once did, in part because companies have realized that fighting back against activists -- by using high-pressure hoses to repel oil-rig invasions, for instance -- tends to backfire. Companies such as Royal Dutch Shell and Procter & Gamble are now taking a nonconfrontational approach to dealing with activists' stunts. "To try and keep people's attention and keep them interested and engaged ... can be very challenging," admits campaigner Laura Kenyon