Methane liberated from arctic wetlands, 25 x impact C02 destroys Ozone layer

Global levels of methane had been roughly stable for almost a decade.

Rising levels in the Arctic could mean that some of the methane stored away in permafrost is being released, which would have major climatic implications.

The gas is about 25 times more potent than carbon dioxide as a greenhouse gas, though it survives for a shorter time in the atmosphere before being broken down by natural chemical processes.