Reuters: After the coldest start to a year in more than a decade, spring will bring relief to the northern hemisphere from Thursday. Bucking the trend of global warming, the start of 2008 saw icy weather around the world from China to Greece. But despite its chilly start, 2008 is expected to end up among the top 10 warmest years since records began in the 1860s. This winter, ski resorts from the United States to Scandinavia have deep snow. Last year, after a string of mild winters, some …