from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Plural form of permafrost.
Sorry, no etymologies found.
Similarly, the permafrosts of Siberia and Canada are beginning to thaw and release huge quantities of greenhouse gases that could further heat our planet.
Thawing of the tundra permafrosts releases methane, increases greenhouse gas and increases global heating.
BTW, even though albedo feedbacks from diminishing ice/snow in general can clearly not be anywhere near as important as at the end of a glacial, it is not absent; the arctic sea and arctic permafrosts are still connected to the climate.
Similarly, a melting of the permafrosts in Siberia could release enough methane to catapult us past the worst IPCC projections.
Given the other evidence for warming -coordinated tropical glacial recession (often despite increased precip, according to the NAS report) and temperate glacial recession, substantially shortened surface freeze season in the arctic permafrosts (this is becoming problematic of high-latitude oil exploration), decreasing arctic ice cover, greater upwards trends seen at high latitudes where there is less urbanization, to mention just a few, I frankly dont see any weight worth considering to the argument that warming trends are a result of UHI effects and not a real global warming.