DeadWood

Dead trees stop pulling their weight. DeadWood finds them and marks them for removal so you don't have to.

How it works

Radars can be set to scan their revealed area for trees that are no longer absorbing pollution, marking them for deconstruction automatically.
A Personal Tree Scanner armor equipment does the same thing around the player directly.
An optional setting stops your own deconstruction marks from accidentally clearing a tree that's still doing its job.

Lorax, a companion mod where destroying the wrong tree has consequences.