According to article, the absolute catastrophe is still ~80 years away, i.e., reaching wet bulb temperature[1]. This would be the time when humans won't be able

According to article, the absolute catastrophe is still ~80 years away, i.e., reaching wet bulb temperature[1]. This would be the time when humans won't be able to survive summers in south asia without technology. I suspect the next big migration crises will start much before that - probably in next 20-50 years - when large swaths of population have no choice but to move up north. The preview of this migration crises may consist slower GDP growth, destroyed farming, food crises, water shortage and so on. [1] https://en.wikipedia.org/wiki/Wet-bulb_temperature https://en.wikipedia.org/wiki/Wet-bulb_temperature