The degree to which CO2 is or isn't a pollutant will be unresolved until there is a demonstrated causality between elevated CO2 and global climate change. There is correlation, but correlation proves nothing.

Recall that for decades science knew there was a correlation between tobacco smoke inhalation and certain medical problems. But causality in that regard is fairly recent. In the mid-20th century Congress began to act in small ways without clear, irrefutable proof of a link. Were they wrong? Its a judgement call.

Correlative is present for CO2 emissions. There is more atmospheric CO2 right now than ever before in recorded history and you have to go back many thousands of years to find a similar CO2 concentration. In the fossil record there appears to be a correlation between elevated CO2 and climate change.