If you have any doubt the balance of the globe has warmed over the last century, view this chart: Produced by NASA, the chart illustrates how temperatures have compared to "normal" (or the 1951-1980 average) from 1880 to present, from pole to pole (-90 latitude to 90 latitude).

http://www.washingtonpost.com/blogs/capital-weather-gang/wp/2013/09/04/an-unmistakably-compelling-ch...