So a quick Google search turned up zilch on the effects of hemp on soil quality, but as for the others…
Wood paper generally comes from logging. It doesn’t make sense to farm trees because they grow too slowly (that should be your first tip-off that we need a replacement of some sort), so already you’re going to have more pesticides, etc. because hemp is a plant you can farm.
The advantage and disadvantage of farms is that they don’t periodically roll in and destroy habitats. The disadvantage part is that new farms permanently roll in and destroy habitats.
Processing is pretty much exactly the same, so no change there. Trees have to have their bark removed, but I think they can keep the leaves, so hemp is probably pretty good on that front. If they have to strip the leaves, there’s more waste in hemp, but mulched leaves can also be sold off provided the systems are in place. Bark is also used and not disposed of. I’m guessing that there’s overall very little waste in both processes.
I… think that’s everything? Probably less expenditure of fuel to harvest because of the predictable location and ease of harvest with combines, as well as the higher yield.
