As there are posts in this thread containing the term "global warming", I can't help but respond.
DM said:
In the interest of putting this to bed as rapidly as possible: "global warming" is a misleading name, because it doesn't necessarily imply only warming.
I certainly agree with you in that I am tired of people pointing out an unusually cold or snowy winter (or technically spring, since we have passed the vernal equinox in the northern hemisphere) as evidence of there being no global warming, and your point here is definitely true. However, the correct way to respond to statements like these is that they are confusing "weather" and "climate". Weather describes what is happening in the atmosphere right now, whereas climate characterizes (averages) the weather over long timescales (typically 30 years or so). Therefore when looking at a raw time series of global temperature anomalies, it is not unreasonable to see dips between certain years due to the actual natural variations (ENSO, AO, etc) but still see an overall anthropogenic warming trend when looking at climatological timescales.
I should note that this goes both ways of course. A single particularly hot year like the last one does not prove that there is global warming by itself, and this is something I tell my friends all the time. It is the actual long term
trend that is important, and the scientific consensus currently supports the existence of a warming trend in the data.
mien said:
The current unusual weather in the northern hemisphere has nothing to do with the El Nina southern oscillation event(which by the way isn't occuring at all right now) but is caused by a massive anticyclone belt surrounding the artic ocean which reversed the west wind circulation throughout the northern hemisphere causing the winds to come from the east. As a result regions in northern and central Europa are receiving cold air originating from Siberia as well as unusual weather thoughout the US and Canada.
Or to be more concise, we are experiencing a fairly large negative Arctic Oscillation (AO) in that cooler polar and arctic air masses are penetrating further to the south. Of course this is an example of natural variability as I have already said above, and the trend in AO is very small compared to the warming trend we see in the temperature record, based on the current scientific literature.
Now as for the actual topic at hand, I got to experience all of this snow in more than one instance. Last Friday I was in Colorado for a grad school visit (if some of you have forgotten, I am involved in climate research) and had to deal with a 2 hour flight delay on the way back to home in central Illinois, only to later see that same system dump another foot of snow over here. Besides having to deal with travel delays, I enjoyed watching all the snow fall considering how little we got last winter.
Due to my inherent desire to address climate change misinformation on smogon, it might be better for me to start my own thread on the subject.