If you culled randomly, "thanos style" as the original poster describes, you would eliminate about 50% of the population in each subgroup. When only the top 10%

If you culled randomly, "thanos style" as the original poster describes, you would eliminate about 50% of the population in each subgroup. When only the top 10% subgroup contributes about 50% of the emissions, you will only eliminate 5% of the emissions, with half the population gone. In reality, eugenics programs cull from the people considered "undesirable" by the elite in a society. The bottom 90% in that chart would likely be targeted and so the impact you'd have on the environmental problem would be even further limited.