2017 was Earth's second hottest year since global estimates became feasible in 1880. The year continued a decades-long warming trend – 17 of the 18 warmest years have now occurred since 2001. pic.twitter.com/PrEyOINNVs

— NASA GISS (@NASAGISS) January 18, 2018

The northernmost permanent weather station in the world, just 440 miles from the North Pole, has warmed to 43°F today -- in the middle of months-long darkness during what is normally the coldest time of the year.

This is simply shocking. I don't have the words. https://t.co/ynX0IkkuAn

— Eric Holthaus (@EricHolthaus) February 24, 2018

Cape Morris Jesup (#Greenland's northernmost observation station) is now reporting temperatures well above freezing today... +6.1°C at the latest observation! Crazy!

Station is provided by @dmidk at https://t.co/kedfPPAg9q. pic.twitter.com/wEcs4B61mo

— Zack Labe (@ZLabe) February 24, 2018

The extreme event continues to unfold in the high #Arctic today in response to a surge of moisture and "warmth"

2018 is well exceeding previous years (thin lines) for the month of February. 2018 is the red line. Average temperature is in white (https://t.co/kO5ufUWrKq) pic.twitter.com/cLeMxSxvWo

— Zack Labe (@ZLabe) February 25, 2018

After a cool(ish) start to 2018, Gulf of Mexico waters are back to near record warmth ?? pic.twitter.com/KyqnPCzToA

— Michael Lowry (@MichaelRLowry) February 25, 2018

The North Pole is warmer than much of Europe right now. pic.twitter.com/7hWpF0EysY

— Robert Rohde (@rarohde) February 26, 2018

Scientists are waiting to see how much this heat wave will affect sea ice. The winter sea ice maximum extent has been shrinking and has hit record lows each of the past three years. Sea ice is already at record lows or near-record lows in several areas of the Arctic. pic.twitter.com/CKAsbkMjXQ

— NASA Earth (@NASAEarth) February 28, 2018