Answer: reforest

AnswerCrossword Clue
REFORESTEngineer refers to plant again (8)
REFORESTDo an ecological job
REFORESTPlant new trees
REFORESTPlant trees again
REFORESTSomething to do after acres of timber burn
reforestReplant with trees; cover again with forest
reforestto replant with trees