What is called planting of trees on a large scale?

Planting of trees on a large scale is called afforestation or reforestation.

* Afforestation refers to the process of planting trees on land that has never been forested before.

* Reforestation refers to the process of planting trees on land that was previously forested but has been cleared or degraded.

Both terms describe the act of establishing forests on a large scale, and they are often used interchangeably. However, there is a slight distinction between the two.