By Zeke Hausfather, Carbon Brief
The year 2017 has seen some of the warmest temperatures ever recorded, only slightly below the record set in 2016. It has also seen unusually low Arctic and Antarctic sea ice for much of the year, though the summer Arctic minimum was only the eighth lowest on record. 2017 is also almost certain to be the warmest year without an El Niño event. When the effects of El Niño and La Niña are removed from the temperature record, the first nine months of 2017 are likely the warmest ever recorded.