임계점이 · 임계점을
critical point, tipping point
Example
기후 변화가 임계점을 넘으면 되돌리기 어렵습니다.
Once climate change passes its tipping point, it's hard to reverse.
Word parts
임 face, verge+계 boundary+점 point
Literally 'facing-the-boundary point' — originally a physics term.
Good to know
Pronounced [임계쩜]; used for science and for social tension: 불만이 임계점에 달하다.