The encyclical letter Laudato Si is available here on the Vatican website.
39. The replacement of virgin forest with plantations of trees, usually monocultures, is rarely adequately analyzed. Yet this can seriously compromise a biodiversity which the new species being introduced does not accommodate. Similarly, wetlands converted into cultivated land lose the enormous biodiversity which they formerly hosted. In some coastal areas the disappearance of ecosystems sustained by mangrove swamps is a source of serious concern.
Planting trees to replace those cut down is not always well-considered. Again, the human effort is limited with the consideration of a tree as an individual organism, and not the realization of the whole–which has been severely damaged by relentless harvesting or even destruction.