The articles are behind a paywall. But I think I'm familiar with what they are talking about. A lot of methane is locked up in methane hydrate. As the world heats up, that melts releasing the bonded methane. Methane is a VERY potent greenhouse gas.

en.wikipedia.org - Methane clathrate

I'm also starting to see articles about how the human body starts to shut down at 104F. At ~120F (50C), sweating does not cool you. I can vouch for the last one. We -in Phoenix- see 115F days routinely every summer. All sweating does is dehydrate you. You need to intake cold water for any cooling. Or just go inside where there's air conditioning.

Poorer nations will not have that option. Heck, people die here because they can't afford air conditioning, or in some places it is uncommon to be installed because it never used to be necessary. Then people die.

All the while the anti-environmentalists were calling environmentalists "tree huggers", saying "put people first". Well, that's what the environmentalists -many of them- were doing. We are dependent on the environment to survive. If we mess it up too much, it will kill us. The Earth doesn't need saving. It will be fine for a few billion more years. Whether any of our descendants survive to see it is the question.