This hypothesis is being contested: https://www.pnas.org/content/113/9/2442 https://www.pnas.org/content/113/9/2442 Although yes, if the old trees don't decomp

This hypothesis is being contested: https://www.pnas.org/content/113/9/2442 https://www.pnas.org/content/113/9/2442 Although yes, if the old trees don't decompose (for whatever reason), then the forest becomes in fact a carbon sink.