산림청은

산림청은

"산림청은" means "The Korea Forest Service is" in English.

Here, '산림청은' identifies the Korea Forest Service as the subject responsible for the action of planting trees.

산림청은 개발된 지역에 나무를 심고 있다.

The Korea Forest Service is planting trees in developed areas.

In this case, '산림청은' denotes the Korea Forest Service as the primary entity conducting and disclosing research.

산림청은 자연 환경 보호에 대한 연구를 발표했다.

The Korea Forest Service has released research on environmental conservation.

Here, '산림청은' is used to refer to the Korea Forest Service as the initiator of the campaign.

산림청은 산불 예방 캠페인을 시작했다.

The Korea Forest Service has launched a wildfire prevention campaign.