Afforestation refers to the establishment of forest on land that was not previously forested, or has not been forested for a long period (commonly defined under UN frameworks as land not forested for at least 50 years). It is distinguished from reforestation, which restores forest on recently cleared land, and from natural regeneration, where forests return without active planting.
Under the Kyoto Protocol (1997), afforestation and reforestation were included as eligible land-use, land-use change and forestry (LULUCF) activities under Article 3.3, and afforestation/reforestation projects could generate certified emission reductions through the Clean Development Mechanism (CDM). The UNFCCC and the IPCC treat afforestation as a carbon dioxide removal (CDR) method because growing trees sequester atmospheric CO₂ in biomass and soils.
Afforestation features in many national climate pledges submitted as Nationally Determined Contributions (NDCs) under the Paris Agreement (2015). It also intersects with the UN Convention to Combat Desertification (UNCCD), the Convention on Biological Diversity (CBD), and the Sustainable Development Goals, particularly SDG 15 (Life on Land).
Policy debates around afforestation focus on several tensions:
- Carbon accounting: how much and how durably planted forests sequester carbon, and whether credits should offset fossil emissions.
- Biodiversity: monoculture plantations (e.g. eucalyptus or pine) can store carbon but provide poorer habitat than native ecosystems, and may damage grasslands or peatlands that are themselves carbon-rich.
- Land tenure and equity: large-scale projects can displace pastoralists, smallholders, or Indigenous communities, raising concerns flagged by bodies such as the UN Special Rapporteur on the right to food.
- Water use: dense planting in dry regions can reduce streamflow and groundwater recharge.
Major initiatives invoking afforestation include the Bonn Challenge (launched 2011), the African Forest Landscape Restoration Initiative (AFR100), and China's long-running Three-North Shelter Forest Program begun in 1978.
Example
In its updated NDC submitted ahead of COP26 in 2021, India reiterated a target to create an additional carbon sink of 2.5–3 billion tonnes of CO₂ equivalent through additional forest and tree cover by 2030, relying heavily on afforestation programs.
Frequently asked questions
Afforestation establishes forest on land that has not been forested for a long time (often defined as 50+ years), while reforestation restores forest on land recently cleared or degraded.
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