In pictures: Polar vortex strikes North America - BBC News
See all 70 polar bears in North American Zoos (interactive) - oregonlive.com
Polar Bear Watching Trips: Tailor-Made Ideas and Group Tours | Wildlife Worldwide
As Polar Vortex Stirs, Deep Freeze Threatens U.S. and Europe - Bloomberg
In pictures: Polar vortex strikes North America - BBC News
From Trout to Polar Bears: How the Environmental Movement Lost America - The American Conservative
Environment America takes legal action to protect polar bears in Alaska | Environment America
americas-arctic-a-refuge-imperiled Off the Fence
What is the polar vortex – and how is it linked to climate change? | US weather | The Guardian
Polar vortex: cold that has killed dozens to give way to 'spring-like' weather | US weather | The Guardian
US braced for -50C temperatures as polar vortex bites
Polar vortex whips millions of Americans with strong winds, freezing temperatures and even snow - CNN
The polar vortex is coming—and raising the odds for intense winter weather
What Does 'America First' Look Like in the Arctic? | RAND
Endangered Species in North America | Endangered animals, Baby polar bears, Animals
Polar Vortex Building in North America
America and Russia work together during challenging times | WWF Arctic
The U.S. is about to get a potent polar vortex blast - Science
Polar Vortex Building in North America
Polar vortex coming in November: Arctic blast to central, eastern U.S.
Weakening polar vortex may yield longer, harsher winters in North America | AccuWeather
Analysis: Polar Vortex collapse causes heavy winter for North America and the Nordics - Kjeller Vindteknikk
Polar Bears Migrate from America to Russia as Temperatures Rise
Polar Imperative: A History of Arctic Sovereignty in North America by Shelagh D. Grant
Cruises to Crossing the Arctic Circle | Holland America Line Cruises
What 5 Million Data Points Tell Us About the Polar Vortex's Impact on Energy Use | Greentech Media
President Trump's New Polar Strategy Is the First Step to Defending the Arctic | Military.com
