The Theory behind global warming is that with more CO2 in the Air (And other substances added to the air such as methane) reflect more of the sun rays BACK to the earth, keeping the earth warmer then it has been. During the Spring, Fall and Summer this works to warm up the planet. During the deepest part of Winter (and only in those areas where it is clearly dark more then it is day i.e must include "False Dawn" and "Twilight" as day periods NOT divide them equally between day and night when we use sunset and sunrise as the cut offs, this is mostly the northern Temperature, Arctic and Antarctic areas) the reverse happens, the increase in CO2 and other green house gases keep temperatures DOWN.
Notice, the affect is for only a small part of the world and for that part that is clearly in the dark more then it is getting any Light from the sun (Indirect lighting does start the warming of the planet even before the sun raise over the horizon, thus why you do NOT see the harshest form of winter in the deep South or the tropics).
Thus one of the side affects of Global Warming is a shorter but harsher winter. i.e. More snow (Warmer air carries more moisture thus more snow, the East Antarctic Ice Sheet is predicted to EXPAND under most Global Warming theories do to increase snow fall do to warmer air flowing from the Pacific to the Antarctic for example, please note I am discussing the East Antarctic Ice Sheet not the West Antarctic Ice Sheet which is predicted to collapse sometime in next few years do to Global Warnings, The East Antarctic Ice Sheet (EAIS) is expected to survive unless we have a drastic increase in Global Temperatures, the West Antarctic Ice Sheet (WAIS) is expected to collapse within the next 10 years, maybe sooner or later no one really knows but it is unstable do to the fact it is based BELOW sea level and as such the warmer waters of the Pacific can heat up the Southern Ocean and thus heart up the WAIS).
I have seen pictures showing the EAIS and how it has expanded by growing around poles installed on the EAIS (The Difference between the top of the poles and the "ground" is half of what it was when the poles were first installed, a reflection of the increase ice Accumulation of the EAIS then anything else. Such an increase is expected in Global Warming, but it does NOT off set the harm caused by Global warming elsewhere.
Other areas where Global warming may be beneficial is Siberia (It is slowly thawing do to Global Warming, opening up more of Siberia for farming and other pursuits and this may be way Russia is opposing Global Warming containment issues, but it is more an excuse for the Russian Ruling Elite to pump out more oil and gas then to help poor farmers in Siberia). Northern Canada is NOT expected to be helped for it has always been colder then the rest of the Arctic (Including the North Pole Itself). Russia has been using it portion of the Arctic Ocean as a short cut between Europe and the Pacific since before WWII (And has increase such use over the last 20 years has the ice has declined even more) but Canada has not do to the extreme cold of that part of the Arctic (But even this has broken up, enough for passage of ships through Canadian waters with minimal use of ice breakers for the first time ever in the last few years). This difference is probably do to the huge flow of fresh water from Siberia into the Arctic. Those Siberian Rivers provide a huge amount of water, starting in the Himalayan Mountains, through Siberia. The McKenzie and Yukon Rivers are minor Compared to those Siberian Rivers (And the Yukon flows into the Bering Straits NOT the Arctic). Furthermore the Greenland Ice Sheet helps keep the temperature down in that part of the Arctic. Siberia has no similar huge ice sheet on its side of the Arctic (Trough the Greenland Ice Sheet is expected to melt severally over the next several decades do to global warming).
A further factor is wind, at present the theory is that the wind is a product of the planet, as a whole, trying to equal out the extreme cold of the polar regions with the extreme warmth of the tropics. It is now believed that the reason the Sahara desert formed was that the temperatures of the Sahara DROPPED over the last 5-10,000 years causing the monsoons to stop flowing from the Antarctic (Via the Atlantic Ocean) leading to a drop in moisture in the Sahara causing the desert to form (Up to the time of the Roman Empire, Horse could still be used in the Sahara, Rome introduced Camels to replace the horse as the desert was drying up even at that time period). Now, notice this was do to a DROP in world wide Temperatures NOT the increase over the last 200 years (Through may be tied in with the "Mini Ice Age" of the 1400-1850 period).
My point is simple, snowier winters are signs of Global Warming NOT signs that it is NOT occurring. Colder (but Shorter) cold snaps during the months of December and January (In the Northern Hemisphere) is also expected. None of this is expected to complete offset the longer and hotter summer months that we have been experiencing since the 1990s. The best explanation for these events, given what we know at the present time, is global warming.
Now if you want to give yourself a scare, look up what happened about 120,000 years ago at the start of the last Ice age. In many ways it is similar to what is occuring now except it was a nature increase in CO2 levels NOT the man made increase we are doing at present. Some Societist call it the "Madhouse century" for global warming appears to have lead to the start of the Ice Age. For more see the following:
http://www.imaja.com/as/environment/can/journal/madhousecentury.htmlOne of the reason the Arctic is not as cold as the Antarctic is do to the currents that occur under the Ice:
http://www.democraticunderground.com/discuss/duboard.php?az=view_all&address=389x2072018#2073462More threads on this concept:
http://www.democraticunderground.com/discuss/duboard.php?az=view_all&address=115x41468#41745http://www.democraticunderground.com/discuss/duboard.php?az=view_all&address=115x131519http://www.democraticunderground.com/discuss/duboard.php?az=view_all&address=102x4073980#4074385http://www.democraticunderground.com/discuss/duboard.php?az=view_all&address=115x19573#19611http://www.democraticunderground.com/discuss/duboard.php?az=view_all&address=115x106152http://www.democraticunderground.com/discuss/duboard.php?az=view_all&address=115x182408World Wide movement of water in the ocean:
http://www.democraticunderground.com/discuss/duboard.php?az=view_all&address=102x1675587#1676836