Forest recovery resulting in net increases in forest extent can occur by means of spontaneous regeneration, active planting, or both. There are two main paths in
reforestation, one emerging from economic development and another from forest scarcity. There are many causes of transition, foremost, economic development leads to
industrialisation and
urbanisation, pulling the labour force away from the countryside to cities. For example, in Puerto Rico, industrial policies which subsidised manufacturing led to a transition towards urban sector manufacturing and service jobs, leading to land abandonment and forest regrowth. Furthermore, changes in agricultural technology make the most productive areas more agriculturally productive, concentrating agricultural production into those areas. Redistribution of labour resources from areas of low fertility to areas of greater fertility promotes regrowth in the areas experiencing depopulation. Demand for
forest products, especially wood, resulting from earlier deforestation, also creates market incentives to plant trees and more effectively manage forest resources. Due to forestry intensification, higher forest productivity saves remaining forests from exploitation pressures. Moreover, cultural responses to losses in forest area lead to government intervention to implement policies promoting reforestation. A
Kuznets curve analysis of the problem, where income leads to forest regrowth, has contradictory results, due to the complex interaction of income with many socioeconomic variables (e.g. democratisation, globalisation, etc.) The factors which drive deforestation also control the forest transition, promoting urbanisation, development, changing relative agricultural and urban prices, population density, demand for forest products, land tenure systems, and trade. Transitions involve a combination of socioeconomic feedbacks from forest decline and development. == Global forest transition ==