Explain the term 'reforestation'.

Reforestation refers specifically to the process of planting trees in an area that has been deforested. This action aims to restore the forest cover that has been lost due to various factors such as logging, natural disasters, or land-use changes. By reintroducing trees to these areas, the ecosystem can begin to recover, providing habitats for wildlife, enhancing soil stability, and improving air quality.

Reforestation is an important practice for combating climate change, as trees absorb carbon dioxide from the atmosphere. It also helps to preserve biodiversity, increase aesthetic value, and provide resources such as timber and recreational spaces in the long term.

The other options describe different activities related to forest management or land use but do not accurately capture the essence of reforestation. Sustainable logging involves methods to harvest timber responsibly without impacting the forest's health significantly. Clearing land for agriculture pertains to land conversion rather than restoration. Managing existing forest resources involves practices like thinning and selective logging but does not imply the act of planting new trees in deforested areas.