Too little would be bad, yes, but too much is also bad. We can reduce CO2 by a huge amount and still have more than the amount needed for a temperate world.

We are so far over the desired greenhouse gas levels that it's a crisis and reducing it is necessary if we're to continue being able to live in relative comfort. We're not even near the ballpark of having so little greenhouse gas that this would be a worry.

Rush to reduce the dangerous growth of CO2. Reducing CO2 is a pipe dream right now.

> potential ice age > Why the worldwide rush to reduce CO2 then?

Illustrated answer:

https://xkcd.com/1732/