You may remember that Arctic Sea Ice was dramatically declining until the record low of 2012. The temporary reprieve came from "planetary wave resonance" causing low pressure systems to linger in the Arctic with cooling clouds in Summer, but "the wind pattern that causes abrupt Arctic cooling didn’t occur in the summers of 2019 and 2020, and the sea ice minimum record was nearly broken in both years." Resonance happens because the jet stream is slower and more meandering as Arctic temperature rises. We've enjoyed a temporary slowing of sea ice decline.
Prepare yourself for Arctic Sea Ice to get worse from here on. <sigh> Methane hydrate destabilization has begun, a long-dreaded positive feedback.
… frozen methane deposits in the Arctic Ocean … have started to be released over a large area of the continental slope off the East Siberian coast,…
High levels of the potent greenhouse gas have been detected down to a depth of 350 metres in the Laptev Sea near Russia, prompting concern among researchers that a new climate feedback loop may have been triggered that could accelerate the pace of global heating.
… observationally confirm the methane release is already under way across a wide area of the slope about 600km offshore.
The latest discovery potentially marks the third source of methane emissions from the region. [emphasis mine]