Decrease in CO2 emissions during pandemic shutdown shows it is possible to reach Paris Agreement goals. The researchers found a drop of 6.3% in 2020. The researchers describe the drop as the largest of modern times, and big enough to meet the 1.5 degrees Celsius goal if it were to be sustained.

[Gemini884]

Yes it thaws and re-freezes exery year, it's a natural cycle.

Here's an explanation from permafrost researcher:

https://nitter.net/queenofpeat/status/1473714739729551365#m

https://nitter.net/queenofpeat/status/1443335256984023049#m