"Arctic methane release is a well recorded phenomenon. Methane stored in both permafrost (which is melting) and methane hydrates (methane trapped in marine reservoirs) are vulnerable to being released into the atmosphere as the planet warms. However, researchers who are trying to map atmospheric greenhouse gas concentrations on a global basis have discovered that the amount of methane emissions in the Arctic region do not total up. Further research revealed that significant amounts of methane releases came from the Arctic ocean (abstract) — as much as 2 milligrams of the gas is released per square meter of ocean, each day — presumably by marine bacteria surviving in low-nutrient environments."
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