We're still dangerously close to those levels.
I've tried to point out to carbon alarmists the central role of atmospheric CO2 in supporting life on this planet. When plants die off because of insufficient CO2, this means that everything that depends on plants also dies off from lack of carbon. You can't remove a ton of CO2 from the air without decreasing the existing biomass by a ton.
The answer I've received from alarmists is that it's okay for plants requiring a relatively high concentration of CO2 to die off, because there will still be other plants that can survive on lower CO2 concentrations. They simply cannot (or refuse to) understand the link between CO2 and total biomass.