didn't find it on instagram but here is an article with the same headline but it's from 2023 https://www.economist.com/finance-and-economics/2023/10/30/what-a-third-world-war-would-mean-for-investors and behind a pay wall
even killing the poorest 50% of people on earth would almost nothing to prevent the climate collapse because they have such a miniscule carbon footprint, the richest 1% however..