No, if the trees are sucking up the CO2 and hanging on to it, that's a decrease in atmospheric CO2.
The overall cycle returns to "net zero" when the wood burns or rots.
If there is a natural cycle wherein growing trees suck up CO2 and dying trees release it, then overall there is a NET ZERO effect on the CO2 levels.
If you chop down the trees and burn them and disrupt the cycle, then you are having a positive effect on the cycle. (Enviro-whackos will call it a negative effect on the environment, naturally.)
We're arguing perspective. Like the guy jogging at 5mph on the top of top travelling 60 mph. If you're on the train, has going 5 mph. If you're on the ground, he's going 65 mph.
TS