Silent safeguard: The permafrost is melting, what does this mean? One of Earth’s largest carbon reservoirs is beginning to release ancient carbon into the world, spreading undiscovered pathogens. The permafrost contains an estimated 1500 gigatons of carbon, roughly 2x currently in the atmosphere.
Source: The_Weekend_Baker
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It means oh….. deep excrement.
Well, it might mean that if any significant proportion of it melts.
However, even if it doesn’t (all melt quickly), the carbon budgets the world’s politicians have been making were pretending it won’t melt at all and/or didn’t count.