Agence France-Presse: Millions of people in northern Europe are still battling snow and ice, wondering why they are being punished with bitter cold when - officially - spring has arrived and Earth is in the grip of global warming. Yet some scientists, eyeing the fourth year in a row of exceptionally harsh late-winter weather in parts of Europe and North America, suggest warming is precisely the problem. In a complex tango between ocean and atmosphere, warming is causing icy polar air to be displaced southwards, they...