When geologist Duane Froese of the University of Alberta (Canada) found a 740,000-year-old wedge of ice poking out of Yukon's frozen soil,he knew that his discovery might be spun out of context.rnScientists have become increasingly concerned about permafrost because as it thaws,it releases CO2,methane,and other greenhouse gases that could kick global warming into higher gear.But Froese's discovery of ancient permafrost suggests that some permafrost has survived climates warmer than today's.'I worry about the climate skeptics thinking we don't have to worry [about permafrost thawing],' he says.He even wrote his own press release so that he could tailor the message.
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