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The Earth has warmed since the end of the "little ice age" which lasted from about 1350 to 1850, a time during which glaciers advanced, crop failures increased, deaths from epidemics and plague were common and Washington crossed an ice-choked Delaware river. So, we were due for an upturn and we have gotten it.
Prior to that, we had the medieval warming period, which lasted from 800 to about 1300. This was when the Vikings were the terror of Europe and Greenland was actually green. Since this starting point, it has cooled.
So as you can see, the warming we have experienced since the end of the little ice-age is not unusual or unexpected at all. And neither is the cooling we have experienced since the medieval warming period.
It all depends on when you start your measurements.
Or where....The medieval warming period only affected the northern hemisphere.
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