The Contradiction at the Heart of a Green City
Singapore has built its global reputation as a lush urban oasis, a so-called “City in Nature” where skyscrapers emerge from verdant canopies and vertical gardens climb concrete walls. The city-state has committed to planting one million additional trees across the island by 2030, deploying microforests, skyrise greenery, and intensive urban greening initiatives to combat the tropical heat and support biodiversity. Yet beneath this emerald veneer lies a troubling contradiction. While government agencies and private developers race to plant new trees, bulldozers are simultaneously clearing ancient secondary forests to make way for public housing estates, industrial parks, and infrastructure projects. This tension between expansion and conservation captures what environmentalists have termed Singapore’s “green paradox,” a complex balancing act that raises fundamental questions about what kind of nature a modern city truly values.
The statistics paint a nuanced picture of a nation wrestling with its limited land area. Singapore has successfully greened approximately 47 percent of its spaces since the 1960s, creating a network of parks, gardens, and nature reserves that support surprising biodiversity for an island of just 728 square kilometers. However, up to 7,331 hectares, roughly 10 percent of the country’s total land area, could be developed under current urban planning masterplans over the coming decade, much of it covered by secondary forests that have regenerated over abandoned agricultural land and villages. These forests, which account for 18 to 20 percent of Singapore’s total area, represent decades of natural recovery but enjoy limited protection against development needs driven by a growing population.
From Agricultural Wasteland to Garden City
Understanding Singapore’s current environmental dilemma requires looking back at its ecological history. The island lost most of its original primary forest cover during the early 1800s when colonial agriculture, particularly rubber and gambier plantations, swept across the landscape. By the time Singapore gained independence in 1965, the island was largely deforested, covered instead by degraded agricultural land and urban sprawl.
The transformation began under the vision of founding Prime Minister Lee Kuan Yew, who championed the “Garden City” concept as essential to quality of life and economic competitiveness. Speaking about this historical shift, Anuj Jain, director at the biomimicry consultancy bioSEA, explained the rapid regeneration process that followed agricultural abandonment:
“So, if you leave the land right, very quickly, it becomes secondary forest.”
These regenerating forests, while not pristine primary rainforest, developed complex ecosystems over decades, supporting wildlife from endangered birds to rare millipedes. Today, Singapore maintains a small percentage of primary forest within its four gazetted nature reserves, while secondary forests occupy nearly a fifth of the island. The remaining green areas comprise manicured parks, gardens, and novel ecosystems like vertical gardens and rooftop greenery. This evolution from “Garden City” to “City in Nature” represents a shift from ornamental landscaping toward ecological functionality, though critics argue the transition remains incomplete.
Microforests and the New Urban Cooling
Among the most innovative responses to the green paradox are microforests, small, densely planted areas using the Miyawaki method that mimic natural forest structures. Singapore real estate developer City Developments Limited (CDL) has emerged as a pioneer in this space, establishing a 260 square meter microforest at City Square Mall in Little India during March 2025, then doubling its size within a year.
The results have been striking. Data collected by National University of Singapore (NUS) researchers shows temperatures within the microforest are up to 5 degrees Celsius lower than surrounding roadside areas at midday, with cooling effects extending 1 to 2 meters from the forest edge. Acoustic monitoring detected 31 bird species, including oriental pied hornbills once extinct in Singapore, while environmental DNA sampling suggests approximately 70 percent greater species richness compared to nearby grass patches.
However, scale presents substantial limitations. Professor Veera Sekaran of NUS’s Regenerative Agritech Centre, who designed CDL’s microforest, notes that such projects need a minimum of 150 to 200 square meters to effectively cool surroundings and harbor meaningful biodiversity. Research indicates that forests covering more than 10 hectares can cool their surroundings by 1 degree Celsius within 330 meters of the perimeter, but smaller urban plantings offer far less climate regulation. This disparity raises questions about whether microforests can truly compensate for the loss of larger secondary forest tracts.
Beyond Ornamental Gardening
Perhaps the most pointed critique of Singapore’s greening strategy centers on what is being planted, not just how much. Professor Sekaran has urged the city-state to reduce its reliance on ornamental species, arguing that current urban greening depends too heavily on imported decorative plants rather than native vegetation adapted to local conditions.
The distinction matters considerably for climate resilience and maintenance costs. Ornamental plants, while visually appealing, often struggle in Singapore’s increasing heat, attract pests and diseases, and require intensive maintenance including pruning, grass cutting, and fertiliser application. Native species, conversely, are adapted to extreme heat, support richer biodiversity, and require minimal intervention once established.
Sekaran is applying this philosophy to his work developing a masterplan for the 150-hectare NUS campus, pushing to replace manicured landscapes with indigenous species and spontaneous regeneration. Native plants like the critically endangered rambai tree (Baccaurea motleyana) and the tongkat ali tree (Eurycome longifolio) not only survive better in urban conditions but provide food sources for local wildlife and medicinal value for humans.
The Building and Construction Authority’s (BCA) Green Mark certification scheme currently awards points for using Southeast Asian species and creating wild landscapes, but Sekaran argues more weight should be given to native plant use. The BCA maintains that the scheme takes a comprehensive approach balancing multiple metrics, though supply chain constraints persist, with local nurseries often struggling to source native species compared to ornamental imports.
The Policy Gap: Missing Legal Safeguards
Behind the physical transformation of Singapore’s landscape lies a significant legislative vacuum. Unlike many developed nations, Singapore has no comprehensive Environmental Impact Assessment (EIA) law mandating systematic evaluation of ecological consequences before development approval. While tools exist for assessing which secondary forest plots to conserve or develop, environmental advocates have long called for stronger legal frameworks to formalize protection processes.
The absence of biodiversity offset mechanisms further complicates the equation. When developers clear forests in other countries, they are often required to compensate by protecting or restoring equivalent ecological areas elsewhere. Singapore has not adopted such offset systems, meaning forest loss is rarely compensated on a like-for-like basis in terms of ecological function or timing. The One Million Trees programme, while ambitious, focuses largely on peripheral parts of the island rather than replacing specific lost habitats within the urban core.
This regulatory gap leaves decision-making vulnerable to short-term economic pressures rather than long-term ecological sustainability. As one expert noted, decisions about the role of nature in shaping Singapore’s construction industry should not be left solely to engineers, calling for ecologists to be more involved in designing certification frameworks and planning processes.
Changing Minds: From Garden City to Wild Appreciation
The success of Singapore’s green transition ultimately depends on whether its residents truly value wild nature or merely tolerate curated greenery. The “Garden City” model instilled appreciation for manicured landscapes, but comfort with spontaneous, untamed vegetation remains limited. Building owners often resist naturalistic planting, fearing it will attract wildlife into close proximity with urban populations uncomfortable with such encounters.
The COVID-19 pandemic may have catalyzed a shift in public perception. During lockdown periods, when maintenance crews could not access sites, large areas of green space grew wild. Sekaran observed:
“During Covid, more people began to sit in nature and appreciate that spontaneous greenery was not so bad. We started to move away from the manicured landscapes we had been used to under the ‘garden city’ model.”
Citizen science initiatives are helping bridge this gap. CDL’s microforest project incorporated the iNaturalist platform, recording 65 observations across 46 species by engaged residents. An adjacent “Eco-Train,” a repurposed air-conditioned subway carriage designed to educate children about forest ecosystems, has attracted 70,000 visitors since March 2025. Such programs aim to foster recognition of nature’s inherent value beyond its aesthetic or utilitarian functions.
The Economics of Forest Loss and Recovery
The financial calculus of Singapore’s green choices reveals stark trade-offs. Establishing CDL’s microforest cost approximately S$69,000 (US$54,000), largely due to the compressed two-month timeline requiring mature trees alongside saplings. However, operational costs plummet compared to traditional landscaping, with native species eliminating needs for constant pruning, pesticide application, and irrigation.
The cost of forest loss extends beyond immediate development gains. Secondary forests provide ecosystem services including carbon sequestration, air purification, water management, and stormwater retention. As climate change intensifies rainfall patterns, Singapore relies increasingly on green areas to collect water and direct it toward retention ponds serving as urban wetlands. Replacing these functions with engineered solutions carries price tags that often exceed the short-term profits of development.
Yet housing demands exert irresistible pressure. With limited land and a growing population, the government faces difficult choices between conservation and accommodation. The clearing of secondary forests for public housing estates represents democratically supported development meeting citizen needs, complicating the narrative of environmental destruction versus protection.
What to Know
- Singapore has committed to planting one million trees by 2030 while simultaneously clearing secondary forests for housing and industrial development, creating a “green paradox.”
- Secondary forests cover 18 to 20 percent of the island but face threat from development plans affecting up to 7,331 hectares over the coming decade.
- Innovative microforest projects using native species have demonstrated temperature reductions of up to 5 degrees Celsius and 70 percent greater biodiversity compared to grass patches.
- Experts urge Singapore to reduce ornamental planting by shifting from imported decorative plants to native species that offer better climate resilience and lower maintenance costs.
- Singapore lacks comprehensive Environmental Impact Assessment laws and biodiversity offset mechanisms, creating policy gaps in ecological protection.
- The island lost most original forest cover in the 1800s to agriculture, with current secondary forests representing decades of regeneration on abandoned land.
- Public perception is shifting from manicured “Garden City” aesthetics toward appreciation of wilder nature, though discomfort with urban wildlife persists.
