Sorry. You didn't mention depopulation, I falsely inferred this. My bad.
As for the non-issue. You're in la-la land. Even if the increases in carbon didn't contribute to a warming of the atmosphere (which is nonsense and being spewed out by oil companies as a disinfo campaign) , it's scientifically proven to cause the oceans acidification which we are observing in real-time. This leads many marine lifeforms, including the bacteria which provide the bulk of our oxygen supply, to die out.
The non-issue you refer to is actually an issue which can cause an ELE (extinction level event). Carbon emissions are horribly, no matter how ya look at it. We're already passed 390ppm, and many argue that this is already passed a tipping point of irreparable damage.
As for carbon not heating up the atmosphere.
Check out the temperature differences when planes are grounded, like on 9/11, as compared to when
they are not. We know that the temperature is being artificially dropped by the existence of contrails/chemtrails. When this is taken into account, it
becomes very obvious that the earth has been warming for quite some time, and it's (at least in part) due to our hydrocarbon emissions.
...Researching 
