Unauthorized drilling logistics in Greenland: A Texas-based firm linked to Trump shipped drilling equipment to Greenland’s east coast without Nuuk authorization, prompting a “strong warning” from the mineral resources ministry and raising a standoff over permits near wetlands. Cruise tourism limits: Greenland’s government advised cruise ships to avoid some fjord areas to reduce impacts on vulnerable nature, wildlife, and local hunting and fishing. Greenland Sea sea ice swings: A new study reports sharp recent Greenland Sea ice expansion alongside regional cooling, pointing to natural variability in circulation, freshwater, and weather patterns. AMOC “heat valve” research: New findings tie a weakening Atlantic circulation to greater heat storage by the planet, complicating assumptions about how warming shifts during major ocean changes. Deep North Atlantic oxygen source: Another study identifies the Labrador Sea as a key oxygen exporter that helps sustain deep North Atlantic ecosystems. Narwhal tusk mystery: X-ray work explains how narwhal tusks form their twisted structure, revealing a built-in “counterbalance” in the tooth. Iceland EU vote: Iceland will hold a referendum on Aug. 29 on restarting EU accession talks, a decision that could reshape Arctic-era economic and strategic alignment. Night-sky light pollution spotlight: A photography contest highlights how light pollution threatens dark skies, including images of aurora and satellites.