Arctic Weather Plunges into North America
Oldest polar bear in human care in North America dies at Milwaukee zoo | CNN
In pictures: Polar vortex strikes North America - BBC News
Deadly polar vortex grips North America - YouTube
North America - WildLife Foundation
The U.S. is about to get a potent polar vortex blast | Mashable
Polar Bear Watching Trips: Tailor-Made Ideas and Group Tours | Wildlife Worldwide
Polar Bear Facts: Animals of North America - WorldAtlas
Polar vortex causes record cold in US | KidsNews
Analysis: Polar Vortex collapse causes heavy winter for North America and the Nordics - Kjeller Vindteknikk
Weakened 'polar vortex' blamed for N. American chill
Weakening polar vortex may yield longer, harsher winters in North America
Polar vortex whips millions of Americans with strong winds, freezing temperatures and even snow | CNN
The Coldest Air of the Winter Season 2021/22 Heads for the Northeast U.S. as Polar Vortex Pushes Another Frigid Cold Blast from Canada on Sunday
Polar Vortex Building in North America
Extreme polar cold is about to pummel the U.S. over the holidays | Mashable
Environment America takes legal action to protect polar bears in Alaska
America's Arctic - A Refuge Imperiled - Terra Mater Studios
How frigid polar vortex blasts are connected to global warming
What is the Polar Vortex?
In pictures: Polar vortex strikes North America - BBC News
North America polar regions - Digital Commonwealth
U.S. Polar Bears Are Losing. Here's Why. | Defenders of Wildlife
The Polar Vortex is Causing Extreme Cold in Parts of the United States - Geography Realm
Polar Bears Migrate from America to Russia as Temperatures Rise
