In coastal Alaska, archaeological sites are now threatened by a one-two punch. The first blow: average temperatures that have risen more than three degrees Fahrenheit in the past half century.

For two weeks I’d been visiting northern Alaska coastal ... the past few summers, so much ice has melted that the Northwest Passage actually became navigable. “We’ve never seen ice melt ...

"The warm temperatures caused existing snow and ice to melt and new precipitation to fall as rain." As climate change heats up the planet, Arctic regions such as Alaska are experiencing dramatic ...

Instead, Levy documented through LIDAR and time-lapse photography a rapid retreat of ground ice in Garwood Valley, similar to the lower rates of permafrost melt observed in the coastal Arctic and ...