But — not all parts of it are heating up at the same rate. Temperature in the Arctic in particular is rising faster than the global average. The Arctic, according to NASA data, warmed by about 2.2 °C (4 °F) between 1900 and 2015.
Their estimate of Arctic heating is considerably bigger than NASA's. It indicates that between 1900 and 2015, Arctic temperature has risen about 2.9 °C (5.3 °F).
The extremity of the last couple of months might be even more visible in a plot of monthly average sea ice anomaly (the difference between the month's value, and what's “typical” for that month of the year)
More heat generally means less ice. This is rather obvious in the Arctic lately, as 6 out of 10 months so far this year have set new record lows for the extent of sea ice (2016 values shown in red)
The globe as a whole warmed by about 1.1 °C (2 °F) between 1900 and 2015.