No, because we continue to produce CO2 from burning fossil fuels, and when we respire!
Brief outline of the carbon Cycle follows....those not interested, pleeeeze skip this.
carbon goes into the atmosphere when we respire,
Glucose + Oxygen ---> CO2 + h20
All living things respire, even plants.
CO2 also goes into the atmosphere when we burn fossil fuels, wood etc
CO2 also goes into the atmosphere when things rot, it is the same process as burning, just a lot slower.
there is only one thing that takes CO2 out of the atmosphere....green plants. All green plants do it, not just trees, but trees are super good at doing it, because they grow to be so big, in a limited area of ground. This plants do by photosynthesis.
CO2 + H2O -> Glucose + oxygen (the same equation as repiration but backwards)
And a jolly good thing for us that they do, or we would die from lack of oxygen and food.
You are right, eventually all things will die, and return their co2 'load' to the air, but these trees (if left to nature) would live a long time, and get very big, they would then rot very slowly, so the effect on the co2 level would be ' little and often'.
My point wasn't so much that trees were, of themselves bad, but that by growing them, and cutting them when small, you are doing very little to help the CO2 level, infact, nothing at all in the long term. What we have to do is grow lots more trees, and keep them alive for longer. Then when they are big, cut them down and use the wood for contruction. That way the co2 stays 'locked up'. And trees are a re-newable resource. We also need to burn less of everything, and reduce the co2 going into the atmosphere.
As I said, blame it on the KS4 curriculum! I'm not that green a person, but this is a very good topic to get kids thinking! And me for that matter.