> the gases in the permafrost and antics will make it hard to breathe To my understanding there have been periods within the last few thousand years where it's

> the gases in the permafrost and antics will make it hard to breathe To my understanding there have been periods within the last few thousand years where it's been hotter for various reasons (but usually in a cyclical way), so I'm not sure why the permafrost wouldn't have melted then and made it harder to breathe. That said, when searching I'm mostly seeing stuff about the greenhouse gases (methane, CO2) released by these permafrost frozen lakes, not breathing problems. It could be that those are contributors to some of the wild swings we've seen in the past, and if we're already wildly swinging prior to that, it could just make the swings all the more pronounced.