The Ninglick River is eating away at the shoreline in Newtok, Alaska, shown here in August 2016. Engineers estimate the village is losing 70 feet of land per year.
Eric Keto/Alaska's Energy Desk
A resident of the town formerly known as Barrow, Alaska, rides her motorcycle along an Arctic Ocean beach in 2005. The town is now officially called Utqiagvik, its Inupiaq name.
The Crystal Serenity, pictured here in Seward, Alaska, is the largest cruise ship to traverse the Northwest Passage, traveling from Alaska to New York City.
Rachel Waldholz/Alaska Public Radio
"An Old Walrus, Or 'Morse' " was drawn by Henry Wood Elliott in 1872. He included it in his book Our Arctic Province, next to a description of a walrus haulout in Alaska's Punuk Islands in 1874.
Light shines on the mountains behind the Mendenhall Glacier in Juneau, Alaska. Guides are using the glacier's rapid retreat as a stark lesson on the effects of climate change.
Aliy Zirkle handles her dogs during a rest in Galena along the Yukon River, her last stop before heading towards Nulato. Late in the night, as she approached Nulato, Zirkle was attacked by a snowmobiler a few miles outside the small community.
Zachariah Hughes/Alaska Public Media