How well would that work for humans? 2000 ppm is well above the threshold when we start to find negative cognitive effects. And I imagine CO2 in buildings would

How well would that work for humans? 2000 ppm is well above the threshold when we start to find negative cognitive effects. And I imagine CO2 in buildings would be more like 3000-4000 ppm. This is leaving aside sea level rise hurting infrastructure, crop failures due to shifting weather, and areas becoming regularly above 35 degrees wet bulb.