Warming global temperatures are transforming Arctic regions, where thawing permafrost and peat fires threaten up to half of the existing infrastructure by 2050.
The new study reviews two decades of research and finds that the world’s permafrost—land that stays frozen all year round—has warmed at an average rate of 0.3° to 1.0°C per decade since the 1980s. In some areas of the High Arctic, the total increase has exceeded 3°C over four decades. The thawing ground is already starting to damage roads and buildings as it shifts and buckles, and scientists expect further impacts as climate change continues to raise temperatures.
Other side effects of climate change are compounding the effects of higher temperatures. The warmer atmosphere has doubled the number of lightning storms in Arctic areas, sparking fires on peatlands. Once the fires burn off the insulative vegetative layer, the ground is exposed and it thaws faster. Both the burning organic matter and melting soil release more carbon and methane into the atmosphere to contribute to the greenhouse effect. The rapidly warming ground also creates vast sinkholes—up to 30 metres wide and three metres deep— in a process called thermokarst.
People continue building in the Arctic despite these threats, and satellite images show that coastal infrastructure has increased by 15%, or 180 square kilometres, since 2000, reports Reuters, citing a different study.