Benefits of
Green Infrastructure
Why Nature-Based Solutions Matter
Green infrastructure and nature-based solutions (NbS) are scalable systems that provide environmental, social, economic, cultural, and public health benefits. They are increasingly used worldwide to improve climate resilience, biodiversity, cooling and canopy shade, public health, food security, stormwater management, and community wellbeing. In Hawaiʻi, we also call them kīpuka — biodiversity islands.
What We Mean by Green Infrastructure
Green infrastructure spans everything from a single rain garden to a city-wide urban forest. In Hawaiʻi, it connects to ancestral systems of ahupuaʻa stewardship — managing land and water from mauka (mountain) to makai (sea) for the benefit of all living things.
Ten Benefits of Urban Forests & Kīpuka
When a community invests in green infrastructure, the returns touch every part of daily life.
- Reduces flooding
- Lowers stormwater runoff
- Reduces erosion
- Recharges groundwater and aquifers
- Improves water quality
- Decreases strain on drainage infrastructure
Trees and plants cool the urban environment through three primary mechanisms. Shade blocks solar radiation from reaching pavement, buildings, and people, directly reducing surface and air temperatures. Evapotranspiration — essentially plants “sweating” — releases water vapor that cools the surrounding air. And vegetation simply absorbs less heat than asphalt and concrete, which store and re-radiate energy long after sunset.
The urban heat island effect occurs when cities become significantly warmer than surrounding rural areas because buildings, pavement, and other built surfaces absorb and retain heat while vegetation is limited. Urban trees can dramatically cool neighborhoods compared to asphalt-dominated areas.
- Lowers ambient air temperatures
- Reduces urban heat island effect
- Makes streets and homes more comfortable
- Reduces energy demand for air conditioning
- Improves outdoor walkability and livability
More information: resilientoahu.org/keepcooloahu ↗
- Supports declining native species
- Increases ecological resilience
- Improves pollination
- Reconnects fragmented habitats
- Increases local food production
- Improves access to healthy food
- Reduces dependence on imports
- Builds community resilience
- Provides educational opportunities
- Strengthens cultural food systems
- Mental health and emotional stability
- Concentration and cognitive function
- Emotional regulation
- Social cohesion and community ties
- Reduces stress and anxiety
- Encourages physical activity
- Enhances community gathering
- Improves child development
- Strengthens sense of place
Research consistently shows that even short exposure to green space — trees, parks, gardens, and natural areas — significantly reduces physiological stress markers. Urban green infrastructure that is accessible, welcoming, and culturally meaningful multiplies these benefits.
Leaves physically intercept and hold fine particulate matter (PM2.5 and PM10) — tiny particles from vehicle exhaust, industrial emissions, and dust that cause respiratory and cardiovascular disease. Stomata on leaf surfaces also absorb gaseous pollutants including nitrogen dioxide, sulfur dioxide, and ground-level ozone.
Trees and plants also sequester carbon dioxide and produce oxygen, contributing to climate stabilization. A mature tree can absorb up to 48 pounds of CO₂ per year.
- Cleaner air
- Better respiratory health
- Reduced pollution exposure
- Carbon sequestration
- Lower rates of asthma and respiratory illness
- Reduced dust and allergen levels
- Flooding damage costs reduced
- Lower municipal water use
- Reduced strain on drainage infrastructure
- Lower cooling costs for buildings and streets
- Reduced healthcare burdens from heat and poor air quality
- Increased property values
- Reduced municipal infrastructure costs
- Lower landscape maintenance costs (with appropriate plant selection)
- Green job creation
- Eco-tourism and beautification
Studies consistently show that every dollar invested in urban green infrastructure returns multiple dollars in avoided costs and economic activity. In Honolulu, the Kaulunani Urban & Community Forestry Program estimates each urban tree provides approximately $90 in annual environmental benefits .
- Increased resilience to climate impacts
- Reduced disaster vulnerability
- Greater long-term sustainability
- Carbon sequestration
- Protection of freshwater supplies
- Buffering of coastal flooding
- Stronger cultural identity
- Community empowerment
- Place-based education
- Restoration of relationships between people and ecosystems
- Community stewardship and leadership
- Intergenerational knowledge transfer
🌎 Systems-Level Benefits
At a larger scale, interconnected green infrastructure stops being a collection of individual projects and begins to function as something greater — an integrated ecological network that transforms the city itself.
This is what the ahupuaʻa concept points toward: not isolated green spaces, but a connected system from the mountain ridge to the ocean, managed as a whole.
Watershed Restoration
Interconnected plantings, wetlands, and stream corridors that function as a living watershed — filtering water, recharging aquifers, and reducing floods across an entire valley or district.
Green-Blue Corridors
Linked networks of vegetation and waterways that allow species to move, water to flow naturally, and communities to connect with nature even within dense urban areas.
Ecological Networks
City-scale biodiversity infrastructure — from native gardens and street trees to larger parks and preserves — that together can support viable populations of native Hawaiian wildlife.
Climate Adaptation Frameworks
Integrated approaches that layer stormwater management, heat reduction, food security, and coastal protection into a single nature-based strategy for long-term urban resilience.
Urban Forest Networks
City-wide tree canopy managed as a shared public resource — sequestering carbon, cooling streets, filtering air, and providing habitat across thousands of private and public properties.
Mauka-to-Makai Connectivity
Restoring the ecological and cultural continuity from mountain to sea — so that land, water, food, and community stewardship are once again part of a single integrated system.
Systems-level interconnection enables:
- Mauka-to-makai connectivity
- Regional biodiversity
- Integrated water management
- Healthier urban ecosystems
- Community self-sufficiency
- Cultural continuity
Be Part of the Vision
Want to grow your own kīpuka ? Explore our Go Native! plant guide, register for a free tree if you live in Waimānalo or the Waiʻanae Coast, or support the work of Grow Good Hawaiʻi with a donation.