BELIZE CITY (Reuters) - Collapsing bridges, bursting sewer pipes and crumbling roads caused by global warming could cost Alaska up to $10 billion over the next few decades, researchers said. Atmospheric temperatures in the northernmost U.S. state have risen by more than 3 degrees Fahrenheit (around 2 degrees Celsius) over the past five decades, Peter Larsen, a resource economist at the University of Alaska Anchorage, told a climate change conference in the Central American country of Belize. Larsen led a study with a team of engineers to calculate how Alaska will cope with the highest temperatures it has experienced in...