Giant hole, thought to have been caused by methane release, is biggest of its kind discovered in Russia’s Yamal peninsula. It is the 17th crater of its kind to be found and documented in Yamal since 2014.

Weatherwatch A recent heatwave in Siberia’s frozen wastes has resulted in outbreaks of deadly anthrax and a series of violent explosions

Scientists rush to site of latest tundra eruption - which formed a crater 50 metres deep - amid fears for homes and key industrial sites.

Changes in traditional diet and lifestyle of native ethnic groups in the Yamalo-Nenets region have brought the first cases of obesity. Change in wildlife routes and climate are among factors causing diets to change.