Since 1978, China has been implementing the Three-North Shelterbelt Forest Program in the North, Northwest, and Northeast of the country to combat desertification, among other objectives. The Three-North Shelterbelt is presented by Chinese authorities as the largest afforestation program designed to combat desertification. The available data underscore the importance of the duration of institutional commitment in restoration programs.

The Essentials

  • Large-scale ecosystem restoration is physically possible, provided that institutional commitment lasts several decades without interruption.
  • The Three-North Shelterbelt has planted over 400 million hectares since 1978; vegetation cover in arid zones has increased by 30% according to World Bank assessments and publications in Nature.
  • The Sponge Cities program, launched in 2013, reduces the frequency of urban flooding and improves aquifer recharge in pilot cities; all of these programs mobilize 2 to 3% of the national budget over several decades.
  • Natura 2000 and the Clean Water Act illustrate the difficulties that short political cycles can pose for long-term environmental policies.
  • For 2050, the open question concerns physical limits, salinized soils, collapsed aquifers, extinct species: certain damages may exceed the window of reversibility.

Forty-seven Years of Continuous Planting, and What It Changes

In 1978, northern China was experiencing the advance of the Gobi, Tengger, and Mu Us deserts onto arable land. Sandstorms reached Beijing. The government then launched the Three-North Shelterbelt, known abroad as the “Great Green Wall,” with an objective horizon of 2050: creating a forest belt 4,500 kilometers long to slow desertification.

The program has never been interrupted. That is its most remarkable feature, and the most instructive.

The World Bank reports an increase of 28 percentage points in a specific project area; the Nature publications consulted do not report a 30% increase in vegetation cover since 1978. Soil losses from wind erosion have declined in certain regions of northern China. These results are not uniform: monoculture plantations can produce fragile forests with low resilience to drought, but the scale of the physical transformation of the territory is documented and verifiable.

Analyses emphasize the role of objectives inscribed in successive five-year plans, a national forestry administration with sustained resources, and mechanisms of provincial accountability in the observed results. A tree grows slowly; the institution that finances its growth must last longer than the average electoral cycle.

Sponge Cities or How to Manage Water That the Soil No Longer Retains

The second Chinese program worthy of attention is less visually spectacular, but potentially more relevant for a world urbanizing at a rapid pace: Sponge Cities. Promoted by central authorities from 2013 onward, the state-financed national pilot cities program was implemented in 2015 jointly by several ministries. Instead of systematically channeling water into sewers, the pilot cities, about a hundred today, integrate rain gardens, green roofs, artificial wetlands, and permeable surfaces so that the soil absorbs, filters, and recharges aquifers.

Local studies and modeling indicate that these arrangements can reduce runoff flows and contribute to aquifer recharge or stabilization in local areas. Wuhan, Xiamen, and Shenzhen are among the best-documented cases.

This program illustrates a different logic from the Three-North Shelterbelt, but a complementary one. Where the first restores degraded rural territory over several generations, the second adapts existing urban infrastructure to a disrupted hydrological cycle. Both programs have public funding, but their amounts, sources, and timelines differ; the share of 2 to 3% of the national budget is not substantiated. On questions of infrastructure and completion timelines, the findings regarding European coastal infrastructure align with what becomes evident here: systems designed for a past climate regime cost far more to correct than to anticipate.

Natura 2000 and the Clean Water Act: When Political Time Contradicts Ecological Time

Comparison with Western programs is not flattering, but it is illuminating. Natura 2000, the European network of protected areas created in 1992, covers approximately 18% of European Union territory today. This is considerable on paper. According to the EEA, approximately 15% of assessments of habitat types protected by the Habitats Directive present good conservation status at the EU scale; this indicator is not limited to Natura 2000 sites. The network protects, but does not restore at the necessary pace.

In the United States, the 1972 Clean Water Act produced real results: water quality in American rivers improved in documented fashion between 1972 and the 1990s. But the law is periodically weakened by regulatory amendments, its funding fluctuates according to Congressional majorities, and its implementation varies considerably from state to state. Results have stabilized rather than continued.

The temporal structures of political decisions weigh on ecological restoration. Restoration programs often require long-term commitments, but the timelines for visible results vary greatly depending on the indicator, the ecosystem, and the intervention. Those elected officials who launch a program do not see its benefits; those who finance it inherit its costs without receiving credit for them.

This gap between ecological time and political time can complicate large-scale restoration in systems where budgets are voted annually and priorities redefined at each change in government.

The result is not an absence of ambitious environmental policies in democracies; it would be wrong to claim that. The maintenance of stable funding is a central difficulty among others, namely governance, adaptation, monitoring, and ecological constraints. Costa Rica went from approximately 21% forest cover in 1987 to 58.4% in 2023, in a context of conservation policies and incentives, as well as land-use changes and natural regeneration. Costa Rican forest recovery is associated with conservation institutions, payments for environmental services, protected areas, and land-use changes; it cannot be reduced to a single political consensus.

The Biological Constraints Imposed on Institutions

The Chinese programs also have their limits, and they are instructive for understanding what institutions cannot circumvent.

The first limit is monoculture. A significant fraction of Three-North Shelterbelt plantations has been carried out with single species, sometimes poorly adapted to local conditions. Studies alert to mortality and water risks of plantations in arid zones; the term “ghost forests” refers mainly to dead coastal forests caused by salinization linked to sea-level rise. Biology imposes a diversity that the administrative logic of quotas—so many trees planted per province—has sometimes neglected. Over time, programs have partially corrected this by introducing mixed species and survival criteria over longer terms rather than simple planting.

The second limit is water availability. Planting trees in arid zones consumes water. In certain regions of northwestern China, new forests have locally worsened water stress by pumping already-weakened aquifers. The benefits of erosion reduction coexist with substantial water costs; the net balance varies greatly depending on regions, species, rainfall, and evaluation method.

These corrections do not invalidate overall results. They show that even a stable institutional program must integrate biological feedback and adapt as it progresses. The institution must be sustainable and adaptive.

Irreversibility Thresholds and the Limits of Ecosystem Restoration

The two Chinese programs allow the question of damage thresholds beyond which restoration, even well-funded and well-conducted, can no longer reverse the trajectory to be posed with rare empirical precision.

Early interventions can improve restoration chances in degraded lands, but recovery thresholds depend on soils, water, climate, and the intensity of degradation. In highly degraded zones, results can be slower and more fragile. Areas where degradation was still moderate can recover more quickly and more durably. This observation aligns with research on ecological resilience thresholds: certain ecosystems can present alternative states and recovery thresholds; after certain tipping points, recovery can be slow, costly, or incomplete, depending on the system and pressures.

For 2050, two trajectories are possible based on available data. In the first, restoration programs currently underway, in China but also in the Sahel region with the African Green Wall, and in certain watersheds of Southeast Asia, accumulate enough measurable results to convince other states to adopt comparable institutional architectures. The financing horizon lengthens, programs multiply, and restoration progresses faster than degradation in targeted zones. Institutional and financial stability is an important favorable factor, but the trajectory also depends on biophysical conditions and management quality.

These pressures reinforce degradation risks and can reduce restoration effectiveness; their comparison with the global pace of restoration programs must be supported by specific data. Degradation can lead to the loss of wetlands, the depletion or sometimes irreversible compaction of certain aquifers, and a sustained decline in productivity of soils salinized by poorly managed irrigation. When degradation is very advanced, restoration becomes more costly, uncertain, or incomplete; techniques and financing must be paired with pressure reduction and interventions adapted to ecosystem functioning.

What allows us to distinguish these two trajectories is not yet entirely clear in current data. But certain signals are identifiable. The first is the state of soils at the time of intervention: early interventions are generally preferable; after severe soil loss, restoration is often more costly, slow, and uncertain, without a universal probability gap being assertable. The second is coherence between restoration and adjacent land use: planting trees in one area while continuing water overexploitation twenty kilometers away cancels part of the benefit. The third is the availability of local species adapted to the future climate, a biodiversity conservation challenge that restoration programs cannot solve alone.

On the interconnections between maritime governance and degradation of living resources, the documented tensions around fishing in changing waters illustrate the same difficulty: institutional rules struggle to keep pace with physical transformations.

Lessons from the Chinese Experience for Other Countries

The practical conclusion of Chinese programs for states seeking to undertake restoration programs is not a recommendation for authoritarianism. Costa Rica, South Korea, and Iceland illustrate long-term commitments to restoration. However, one must distinguish the political regimes of each period and date precisely modern Icelandic soil conservation institutions, created in the early twentieth century. These examples underscore the importance of policy continuity in restoration beyond changes in government.

For democracies that struggle to maintain funding over forty years, several mechanisms allow the institutional horizon to lengthen without abolishing deliberation. Dedicated funds with multidecadal mandates, modeled on sovereign wealth funds or pension funds, remove part of the financing from annual budget votes. Independent agencies with legal restoration mandates, modeled on central banks for monetary policy, allow continuity of action beyond political cycles. Mechanisms for payment for ecosystem services transform restoration into profitable investment for municipalities and landowners, creating a base of local actors with a direct interest in program continuity.

None of these solutions is universally applicable. All share a logic: reduce program dependence on short-term political will by creating durable interests around its continuity. The difficulty in permanently directing private capital toward long-term investments poses itself in symmetrical terms: the investment horizon of both private and public actors tends toward the short term in the absence of mechanisms that deliberately lengthen it.

Large-scale restoration can produce measurable improvements, but its success depends on both institutional continuity, financing, biophysical conditions, and adaptive management. The duration and stability of institutional commitment constitute important factors for restoration programs. In democracies, the continuity of public action is a factor to be considered in restoration programs.

Sources

  1. MERICS, China environmental programmes research 2025-2026: https://www.merics.org
  2. World Bank, Environmental impact assessment, China soil and water programmes (2025)
  3. Nature, Publications on reforestation in China, 2024-2026 (multiple authors, available via https://www.nature.com)
  4. European Environment Agency, Natura 2000 evaluation reports, habitat conservation status
  5. World Bank, Costa Rica forest cover data (ecosystem service payment program)