Canadians find chunk of permafrost that survived steamier climates
                                
                                
                                    (Newser) -
                                    Canadian scientists have found the oldest chunk of ice in North America, the Globe and Mail reports, a discovery that suggests the earth’s carbon-laden permafrost may be more resistant to global warming than once thought. The 700,000-year-old chunk of Yukon ice has stayed frozen through two ancient, hotter...