I don't know if this "Global Warming" thing is caused by humans, a natural phenomenon in climate cycles, or all the above. But I thought this was funny;
Must be Global Warming, Seattle has first white Christmas in about 10 years. I must have plugged in the wrong coordinates when I contacted the Mother Ship.
The climate on our little blue marble has been in a state of change since it formed. There has never been a static environment on this planet but there will come a time when it is static. In about four billion years the sun will grow into a red giant and all the water and air on the planet will be lost to space. Then the sun will shrink into a white dwarf and the earth will become a cold rock in space. From then on the climate will be more or less static and unchanging.