reforestation; forest restoration
Refers to the process of replanting or restoring forests, often after logging, fire, or other damage.
A reforestation project is underway in this region.
Reforestation takes a long time.
森林再生 refers to forest restoration in general, which can include natural regeneration, whereas 植林 is specifically the active planting of trees.
Compound of 森林 (forest) and 再生 (regeneration, rebirth).