So when has the climate NOT been changing? We are in a warming spell. A significant amount of it is human driven, some is probably a natural thing. In my grandson's lifetime we'll probably be moaning about the pinwheels and fields of glass scaring the countryside and using fusion, hydrogen, and who knows what else to drive our vehicles and supply our power. No one can be absolutely sure how long it will take the oceans to absorb the excess CO2 and when we'll enter a natural cooling spell. The long and short of it is that the ice will someday come back (most likely a lot of lifetimes from now) and then it will melt and sea levels will rise, etc., etc., etc., ad infinitum. The climate keeps changing and the weather is fickle. Let's enjoy the show.
Would I like to see some real 2015 like snow stretched over an entire winter? You bet! But I'm not going to whine about a beautiful 50F day with the low winter sun and long shadows under a perfectly blue sky. Maybe I'm just getting old and with a limited number of years to go, everday is good enough.
Let's hear it for Christmas, white or green, and its message of hope born in the least expected place and least convenient time.