Anything you do with biomass is carbon neutral; eg take a tree growing in a forest, over its lifetime it sequests carbon in its growing mass, absorbs C02 and releases oxygen.
If the tree falls over and rots all that stored carbon is eventually released into the atmosphere by the micro-organisms that eat it; it you chop it down and burn it same thing happens; if you build a house with it and 150 years later the house is demolished and burnt or treated timber sent to landfill, same thing happens.
Planting a forest is at a bigger scale, but forests dont last forever, at some point perhaps 500 years hence that forest will get burnt or turned into houses, the return to atmosphere part is just delayed. Any money spent on "Carbon Credits" has amounted to nothing. ie wasted.
Cheers
Mike
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