There is some interesting research* showing that deforested soils take more than a thousand years to rebuild their carbon sequestering ability. So even if there are more trees, we may have done long term damage to the environment:

https://natureecoevocommunity.nature.com/users/169969-peter-...

Paper here: https://www.nature.com/articles/s41561-018-0192-7.epdf

* I should disclose that I know the person doing this research!