As with any business, forestry’s main aim is to make profit. In the forestry business this is achieved by planting the right type of trees, that produce the best timber while taking the shortest possible time to mature.
Although it might be argued that forests grow themselves, one has to ensure the right timber is harvested for maximum profits.
This also ensures that the forest ecosystem is minimally disturbed at any given time of harvesting. This practice also ensures that the weather of the region is hardly affected.