Scientists say there is growing evidence that rising temperatures were catalyst for massive unexplained holes in ground.
Reindeer herders find more craters in the far north in a deepening puzzle for scientists.
Bulging bumps in the Yamal and Gydan peninsulas believed to be caused by thawing permafrost releasing methane.
DNA of a fossil tooth found in the Altai Mountains shows early man and his best friend were together 19,000 years earlier than previously understood.
This is the clearest evidence that our ancestors speared and killed the extinct giant.
Massive Siberian source of diamonds formed by an asteroid 35 million years ago can 'overturn entire world gem market'.