This is a problem because the warming heats up the frozen ground around the Arctic Ocean, where there is a massive amount of frozen carbon which, when it thaws, is turned into methane by microbes.
Til det her. Det er et problem fordi temperaturstigningerne opvarmer de frosne landmasser omkring ishavet hvor der er store forekomster af frosset carbon som mikrober forvandler til methan-gas mens det smelter.