A 15-second NASA time-lapse video shows the steady and rapid warming of the planet since the middle of the twentieth century, with regions in the Arctic and Siberia warming as much as two to four degrees Celsius (3.6 to 7. 2 degrees Fahrenheit) above a long-term average:
 
[youtube=http://www.youtube.com/watch?v=gaJJtS_WDmI]