Agence France-Presse: The dramatic loss of the Arctic ice cap may have been triggered by disruption to the thermal layers of atmosphere stacked over Earth’s far north, according to Swedish research to be published Thursday. The study, published in Nature, offers a new explanation for the rise in the Arctic’s surface temperature, which over the past century has been nearly two degrees Celsius (3.6 Fahrenheit), or twice the global average. Until now, the big suspect in "Arctic amplification" …