 Talk of climate change is no longer fashionable in winter sports. In any case, when you try to analyse one winter compared with any other, it's hard to say what is "normal".  Yet, as we enter the last month of winter 2011, it's possible to say that it has "generally" been a good year for snowfall across North america, and a fairly average one in the alps. Closer to home, Scotland has had its third good winter in a row.  Meanwhile, a 