"The most climate-stressed regions all contained permafrost, which is vulnerable to thaw as temperatures rise," researcher Sue Natali said.

This would dramatically reshape the continents and drown many of the world's major cities. More from News Many of the effects of climate change are irreversible. Sea levels have been rising at a ...

This would dramatically reshape the continents and drown many of the world's major cities. Produced by Alex Kuzoian More from News We learned last year that many of the effects of climate change ...