Ezana OP wrote

The post is two weeks old but still very relevant. Today's reading is 409.6. CO2 accumulation in the atmosphere has increased by 3 PPM year over year for at least the past two years (which represents a significant acceleration over even just a decade ago when the yearly increase was more like 2 PPM/year). If that rate of increase holds, we may hit 425 PPM in five years--spring 2022.