Natural causes, or linked to oil and gas exploitation?
Thousands of carp washed up, but who or what killed them?
Scientist warns of 'environmental disaster' due to 'irreversible' pollution in world's deepest and oldest lake.
Four children among those in intensive care, as locals undergo mass evacuation and quarantining, while reindeer herd decimated.
The ancient mummy of a mysterious young woman, known as the Ukok Princess, is finally returning home to the Altai Republic this month.