One Ocean Expeditions had leased the vessels MV Akademik Ioffe and the MV Akademik from the Russian government.
"Russia probably is not adhering to its nuclear-testing moratorium," Lieutenant General Robert Ashley said.
"It is happening faster than anyone predicted," said one of the researchers in a new report.
Scientists warn that human emissions could reach a level not seen for 55 million years by the 22nd century.
The gene is resistant to one of the world's "last resort" antibiotics.
Due to the possibility of frostbite, tailgating fans are urged to wear layers and to be cautious if they consume alcohol.
It has been estimated that there could be anywhere between 2.2 million and 3.8 million species of fungi on Earth.
Four million people living in the Arctic permafrost area will be affected by damage to infrastructure.
The Russian military's first batch of Tor-M2DT anti-aircraft missile systems is just the latest reason the U.S. is looking to bolster its Arctic presence.
Around 50,000 troops, 65 vessels, 150 aircraft and 10,000 vehicles will take part in Trident Juncture 2018.
NATO allies will carry out exercises in the Arctic this month in response to reopened Soviet-era bases.
What happens to plants in this region could have important consequences for the rest of the planet.
Thawing permafrost is releasing more carbon dioxide than previously thought.
The belugas have fully accepted the orphaned whale into their group.
The permafrost beneath certain lakes is thawing rapidly, which will release a significant amount of methane into the atmosphere.
"There are 180 inhabitants, and we are very concerned and afraid," one resident said.
A hotel in Norway's Arctic archipelago of Svalbard received an unwelcome visitor and the governor had to fly by in a helicopter before the animal left.
The Akademik Lomonosov is on its way to the remote eastern region of Chukotka to provide electricity for 50,000 people.
The controversial floating power plant will be towed through the Baltic Sea and narrow European straits to get to the Arctic.
Evidence that the Arctic is warming rapidly extends far beyond shrinking ice caps and buckling roads.
The video shows what's happening both outdoors and inside the submarine, too.
Glaciers around the world are an important source of fresh drinking water.
Russia's defense minister gave a detailed review of his country's military upgrade in the Arctic.
Troops are training in subzero temperatures with little visibility.
The first member of the flock to spy the recording object goes in for a close-up, before a friend tries to hijack his spot.