Seven facts you need to know about the Arctic methane timebomb [View all]

[redqueen]

From the Guardian, last year.

Dismissals of catastrophic methane danger ignore robust science in favour of outdated mythology of climate safety

Debate over the plausibility of a catastrophic release of methane in coming decades due to thawing Arctic permafrost has escalated after a new Nature paper warned that exactly this scenario could trigger costs equivalent to the annual GDP of the global economy.

Scientists of different persuasions remain fundamentally divided over whether such a scenario is even plausible. Carolyn Rupple of the US Geological Survey (USGS) Gas Hydrates Project told NBC News the scenario is "nearly impossible." Ed Dlugokencky, a research scientist at the National Oceanic and Atmospheric Administration's (NOAA) said there has been "no detectable change in Arctic methane emissions over the past two decades." NASA's Gavin Schmidt said that ice core records from previously warm Arctic periods show no indication of such a scenario having ever occurred. Methane hydrate expert Prof David Archer reiterated that "the mechanisms for release operate on time scales of centuries and longer." These arguments were finally distilled in a lengthy, seemingly compelling essay posted on Skeptical Science last Thursday, concluding with utter finality:

"There is no evidence that methane will run out of control and initiate any sudden, catastrophic effects."

But none of the scientists rejecting the plausibility of the scenario are experts in the Arctic, specifically the East Siberia Arctic Shelf (ESAS). In contrast, an emerging consensus among ESAS specialists based on continuing fieldwork is highlighting a real danger of unprecedented quantities of methane venting due to thawing permafrost.

So who's right? What are these Arctic specialists saying? Are their claims of a potentially catastrophic methane release plausible at all? I took a dive into the scientific literature to find out.

What I discovered was that Skeptical Science's unusually skewered analysis was extremely selective, and focused almost exclusively on the narrow arguments of scientists out of touch with cutting edge developments in the Arctic. Here's what you need to know.

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http://www.theguardian.com/environment/earth-insight/2013/aug/05/7-facts-need-to-know-arctic-methane-time-bomb