Will Planting Saplings Counterbalance Tree Felling?

There are lots of initiatives to plant trees in England and Wales to help limit climate change. These have to more than counterbalance losses of mature trees, if they are to be beneficial. The National Trust (the UK body responsible for protecting stately homes and their gardens) will, however, have to fell more than 30,000 mature Ash trees on its properties, at a cost of £3m (https://www.theguardian.com/environment/2021/dec/08/national-trust-to-fell-at-least-30000-trees-hit-by-ash-dieback). Trees remove and store (in their non-living wood) carbon dioxide from the atmosphere. The removal of this 'greenhouse gas', helps to limit climate change. Pretty obviously, mature trees do this much more effectively, than saplings or 'whips'. The National Trust is having to fell its Ash trees, as they have become infected by 'dieback' (a fungal disease). They note that there has been a 'catastrophic' increase in tree and plant disease. The trust believes this is 'because of climate change'. It's almost as if climate change is resisting puny human attempts to contain it. I do hope the National Trust will not simply burn the felled Ash trees to 'kill the fungus'!