This past winter has set a worrying record in the Arctic, as scientists examining the effects of climate crisis continue to express dismay at the region’s warmest winter since researchers began documenting the climate there.

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At the northernmost tip of Greenland, researchers were “staggered” when they recorded more than 60 hours of above-freezing temperatures in February. Before last month, scientists had observed Arctic temperatures rising above freezing only in the month of February, both for brief periods—suggesting that the region is rapidly changing due to the warming of the Earth.

“It’s just crazy, crazy stuff,” Mark Serreze, director of the National Snow and Ice Data Center (NSIDC) in Boulder, Colorado, told the Associated Press. Serreze is known for his research on the decline of sea ice in the Arctic. “These heat waves—I’ve never seen anything like this.”