Anders Fogh Rasmussen told Newsweek that despite Trump's public condemnation, increased U.S. activity has helped the alliance become stronger than it was at the start of the president's term.
The non-profit says that the Ambler Mining Road would disrupt Western Arctic caribou migration, cross over hundreds of rivers and streams, and interfere with the subsistence lifestyles of rural Alaskans.
One of the islands is about the size of 10 football fields.
The explosion killed at least five people and is believed to have involved a new nuclear-powered cruise missile.
"It naturally raises the question as to whether and how much plastic we're inhaling," researcher Melanie Bergmann said.
"This is the earliest date that large numbers of walruses have been confirmed on shore at Point Lay," said Andrea Medeiros, a spokeswoman for the the U.S. Fish and Wildlife Service.
Climate change is driving rising global temperatures and melting huge amounts of ice in the Arctic, opening the region to the world's great powers.
The Greenland ice sheet is the second largest body of ice in the world, after its counterpart in Antarctica.
Between the Early Middle Ages and the 1970s, levels of lead pollution spiked between 250 to 300-fold.
The arch that connects Greenland and Ellesmere Island normally breaks up in June or July.
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.