For the second consecutive year, the northern reaches of the planet are experiencing unprecedented waves of warm air.
And climate researchers say they've never seen anything like it.
Unprecedented warm weather
To try and understand what is going on, VOA spoke with Mark Serreze, the director of the National Snow and Ice Data Center (NSIDC) based in Denver, Colorado.
The center does all kinds of things, from helping the Navy spot and avoid sea ice, to monitoring the temperatures, weather systems and extent of the sea ice covering the Arctic and Antarctic throughout the year.