USA TODAY TOP STORIES Winter in America: Bemidji, Minn. Americas, Africa and Asia head for 'supercontinent' smashup Freezing conditions paralyze Danube River shipping Russian team hits subglacial Antarctic lake January was USA's 4th-warmest on record Deadly freeze, heavy snow keep slamming Europe Snow traps thousands in Bosnian villages Storm blankets Nebraska after hitting Colorado Dallas-Fort Worth emerges from Texas drought Punxsutawney Phil: Six more weeks of winter Concerns grow over volcanic eruptions Mild, dry winter delights some, depresses others NASA: Global warming caused mostly by humans 2012 off to furious start in tornadoes Cause sought for deadly Fla. highway pileup