3 ms·

Roughly 50 ppm per 30 years. Early 50s was 300 ppm. That seemed to be the upper limit for a long time. There are a bunch of graphs around. It's seasonal and has

• antisthenes 10y ago
  2015 was the first year we broke 3 ppm in a year. Average for the last decade was ~2.25ppm/y 1000ppm by 2100 is probably not going to happen, but considering the significant lag behind the effects, it's starting to look more and more likely that we will hit 1000ppm at some high point, perhaps in the 22nd century, before it starts going down again. Regarding the poisoning comment, that's not very accurate. It's true, there is reduced performance at high CO2 levels, but 1000 is probably the lowest bound for the most sensitive people and the effects aren't really noticeable until high teens. You can still function indefinitely at those levels.