As the Arctic melts, permafrost there has the potential to send huge amounts of carbon into the atmosphere, but exactly how much is up for grabs, depending on what we do to stem climate change in coming years.

As the Arctic warms, the unfreezing of permafrost poses a threat to the planet.

A new study documents evidence of a massive release of carbon from Siberian permafrost as temperatures rose at the end of the last ice age.

The Arctic may seem remote, but the overall rate of global warming, our climate and weather, sea levels, and many ecosystems and species will be affected by the warming that is occurring there.