It’s hard for me to read an article when the clickbait headline is completely walked back in the first paragraph.
Debatable whether that is completely walking back the headline, but the headline is clearly trying to give the impression it's irreversible without actually making a claim that could thereby be defeated: “brink”, “breaching”, “boundaries” “support life” are all very suggestive of irreversible doom, and yet…
How else would you phrase it? “About to cross a line indicating serious danger”? Maybe “approaching a scientific benchmark tied to catastrophic risk”?