Challenge to polar doom warning from respected international expert Professor Peter Wadhams of Cambridge University.
The lake's level is falling, and Mongolian hydro plans would disrupt inflows, and could cause a 'tsunami' of water, say campaigners.
In beach resort of Listvyanka alone, 98 contaminated streams are disgorging sewage and chemical waste into the pristine waters of the world's oldest lake.
Part of Vasyugan Mire - the largest bog in the world - is to become a natural reserve this year, say reports.
Average temperatures in the north of the Kara and Barents seas were 4C to 5C higher than previous years.