Yet nickel capital Norilsk - the city with the highest industrial emissions - does not feature in the top ten.
Abnormally hot May weather resembles midsummer with air temperatures as high as +35C.
BP 'welcomed' the interest from the state company in its holding in Russia's third largest oil producer.
A new book suggests that early Europeans known as Solutreans made the crossing to America over a frozen and glacial ocean.
Total of 110,000 tonnes sent to Europe across the new Northern Sea Route.
Eye-catching numbers have emerged on the expected trade boom from the Arctic route to Europe for Chinese business.
Russian news outlets carry blank pictures to highlight concern over detention of Denis Sinyakov.
Footage shows locals in Norilsk struggle to cope with fierce winter blizzard, but weather warnings save lives.