Incorporating NBS into Infrastructure Investment Plans
Llewellyn van Wyk
Introduction
The October 2023 report by the Intergovernmental Panel on Climate Change (IPCC) raised alarm through the global development sector when it noted that without a global transformation, the world would reach 1.5°C of warming in a little over a decade. It further noted that the policy and infrastructure investment decisions made now will determine whether we can limit global warming to 1.5°C or not. In short, to ensure we don’t exceed the 1.5°C limit, a quick and radical shift away from low-resilience, high-carbon infrastructure to low-carbon, high-resilience infrastructure is needed[i]. Due to infrastructure’s long-term nature, how we design infrastructure today will crucially determine our climate change pathways for generations to come.
This is not new: a report published ahead of the 2021 United Nations Climate Change Conference (COP26) called for a radical change in how governments plan, deliver, and manage infrastructure emphasising the neglected role infrastructure can play in combating climate change, mitigation, and adaptation efforts. The research, Infrastructure for Climate Action, co-published by UNOPS, the UN Environment Programme (UNEP) and the University of Oxford, looks in detail at the influence of infrastructure on climate action across energy, transport, water, solid waste, digital communications, and buildings sectors. The findings highlight that infrastructure is responsible for 79 per cent of all greenhouse gas emissions, as well as 88 per cent of all adaptation costs[ii].
In short, infrastructure’s impact on climate change is impactful and multifaceted, and addressing these challenges requires innovative solutions and a commitment to sustainability.
A Role for Nature-based Solutions (NBS)
Nature-based solutions (NBS) refer to approaches that utilize nature or natural processes to address societal challenges, particularly those related to environmental sustainability, climate change mitigation, and adaptation. These solutions harness the inherent capabilities of ecosystems to provide benefits for both people and the environment. Examples include reforestation to sequester carbon, green infrastructure for stormwater management, restoring wetlands for flood control, and using natural habitats to enhance biodiversity and ecosystem services.
NBS is gaining attention as cost-effective and sustainable alternatives to conventional infrastructure and technological solutions. They offer multiple co-benefits such as enhancing biodiversity, improving air and water quality, providing recreational opportunities, and enhancing resilience to climate change impacts.
The Nature-based Solutions/Conservation Nexus
It is important to distinguish between NBS and conservation.
Conservation is the protection and preservation of the planet’s biological diversity and natural resources to secure their sustainability. Conservation includes protecting plant and animal species, habitats, ecosystems, and important ecological services against threats. Conservation can also involve setting aside parks and preserves, ensuring that species have the habitat they need to survive, or implementing laws to protect endangered plants and animals.
Nature-based solutions, on the other hand, encompass a wide range of approaches—from the restoration of habitats to water resource management, disaster risk reduction, and green infrastructure—to address societal problems. Nature-based solutions are based on the notion that when ecosystems are healthy and well-managed, they provide essential benefits and services to people, such as reducing greenhouse gas emissions, securing safe water resources, making air safer to breathe, or providing increased food security[iii].
NBS and Infrastructure Investment
Nature-based solutions (NBS) and infrastructure investment are interconnected in several ways, especially in the context of addressing environmental challenges and promoting sustainable development. Infrastructure projects that incorporate NBS are typically referred to as one of the following[iv]:
- • Nature-based infrastructure
- • Green or green/grey infrastructure
- • Blue of blue-green infrastructure
- • Hybrid infrastructure
- • Nature infrastructure
Benefits of NBS
NBS offer the following range of benefits:
Green Infrastructure: NBS often involves the implementation of green infrastructure, which uses natural systems or processes to provide various ecosystem services. Examples include green roofs, permeable pavements, and constructed wetlands. Investing in green infrastructure projects can help mitigate the impacts of climate change, reduce urban heat island effects, manage stormwater runoff, and enhance biodiversity.
Resilience and Adaptation: Infrastructure investments that incorporate nature-based solutions can enhance resilience to climate change impacts and natural disasters. As an example, restoring coastal mangroves can provide natural buffers against storm surges and coastal erosion, reducing the need for expensive engineered defences like seawalls.
Cost-effectiveness: Nature-based solutions often offer cost-effective alternatives to traditional “grey” infrastructure. NBS can be up to 50 per cent less expensive than human-caused infrastructure and provide up to 28 per cent added value through benefits like decarbonisation and climate resilience[v]. Despite these advantages, less than 0.3 per cent of current urban infrastructure spending goes toward NBS[vi]. It is estimated that NBS can provide up to 37 per cent of the emissions reductions needed to achieve the targets of the Paris Agreement[vii]. Investing in ecosystem restoration or conservation can provide multiple benefits, such as flood control, water purification, and carbon sequestration, at lower costs compared to building and maintaining engineered structures.
Economic Opportunities: Infrastructure investments in NBS can also create economic opportunities, such as job creation in restoration projects, eco-tourism, and sustainable agriculture. These investments can contribute to local economies while promoting environmental sustainability.
Long-term Sustainability: Integrating NBS into infrastructure planning and investment can promote long-term sustainability by considering the ecological, social, and economic aspects of development. This approach helps to minimize negative environmental impacts, enhance ecosystem services, and support the well-being of communities over the long term.
Overall, integrating nature-based solutions into infrastructure investment can help address pressing environmental challenges, promote resilience, and contribute to sustainable development goals. By recognizing the value of nature in infrastructure planning and decision-making, societies can build more resilient, cost-effective, and sustainable infrastructure systems.
Taxonomy of NBS
Nature-based solutions (NBS) can be integrated into infrastructure investments in various sectors to enhance sustainability, resilience, and cost-effectiveness. NBS within the context of infrastructure can be classified as follows:
Green Roofs and Walls: Incorporating green roofs and walls into building design can help manage stormwater runoff, reduce energy consumption for heating and cooling, improve air quality, and enhance urban biodiversity.
Permeable Pavements: Using permeable pavements in roads, parking lots, and sidewalks allows rainwater to infiltrate into the ground, reducing surface runoff and the risk of flooding while replenishing groundwater supplies.
Constructed Wetlands: Constructing wetlands for wastewater treatment can provide a natural and cost-effective alternative to traditional treatment plants. Wetlands help remove pollutants, nutrients, and pathogens from wastewater while providing habitat for wildlife.
Living Shorelines: Using natural materials like oyster reefs, mangroves, and salt marshes to stabilize coastlines helps prevent erosion, buffer against storm surges, and protect coastal communities from sea-level rise and extreme weather events.
Reforestation and Afforestation: Planting trees along transportation corridors, such as highways and railways, helps mitigate air pollution, reduce noise pollution, enhance aesthetics, and provide habitat connectivity for wildlife.
Natural Floodplain Restoration: Restoring natural floodplains and reconnecting rivers to their floodplains can reduce flood risks, improve water quality, and enhance ecosystem services while providing recreational opportunities and wildlife habitat.
Green Infrastructure for Stormwater Management: Implementing green infrastructure practices, such as bioswales, rain gardens, permeable pavements, and constructed wetlands, helps absorb and filter stormwater runoff, reducing the burden on conventional drainage systems, mitigating flooding, and improving water quality.
Green Infrastructure for Transportation: Incorporating green infrastructure elements like vegetated medians, roadside vegetation, and wildlife crossings into transportation projects promotes biodiversity, reduces habitat fragmentation, and enhances ecosystem connectivity.
Green Spaces and Urban Parks: Increasing the number and quality of parks, green spaces, and urban forests within cities can provide numerous benefits, including improved air quality, reduced urban heat island effect, enhanced biodiversity, recreational opportunities, and mental well-being for residents.
Green Infrastructure Networks: Establishing interconnected networks of green infrastructure, including green corridors, wildlife habitats, and urban greenways, facilitates biodiversity conservation, enhances ecosystem connectivity, promotes wildlife movement, and provides recreational opportunities for residents.
Urban Agriculture and Community Gardens: Encouraging urban agriculture initiatives, such as community gardens, rooftop gardens, and urban farms, not only provides fresh produce for residents but also promotes food security, reduces food miles, improves social cohesion, and enhances urban aesthetics.
Street Trees and Urban Forestry: Planting trees along streets, sidewalks, and public spaces helps mitigate air pollution, provide shade, reduce noise pollution, increase property values, and create habitats for urban wildlife.
Natural Playgrounds and Sustainable Design: Designing urban spaces with natural materials and features, such as natural playgrounds, green alleys, and urban wetlands, promotes active living, childhood development, and environmental education while enhancing ecosystem services and biodiversity.
Brownfield Remediation and Urban Regeneration: Converting derelict or contaminated sites into green spaces, parks, and natural habitats through brownfield remediation and urban regeneration projects revitalizes neighbourhoods, improves property values, enhances community well-being, and restores ecosystem functions.
Conclusion
Implementing nature-based solutions requires interdisciplinary collaboration among policymakers, scientists, businesses, and communities to integrate ecological principles into decision-making processes and land management practices. As climate change and environmental degradation continue to pose significant challenges, NBS offer promising pathways towards building more resilient and sustainable societies.
By integrating NBS into urban planning, design, and development processes, cities can create more sustainable, resilient, and inclusive urban environments that benefit both people and nature. These approaches not only address pressing environmental challenges but also improve the quality of life for urban residents now and in the future.
References
- • [i] WEF 2018. “How sustainable infrastructure can help us fight climate change.” Retrieved from: https://www.weforum.org/agenda/2018/11/building-sustainable-infrastructure-matters-climate-change/ Accessed: Feb 23, 2024.
- • [ii] Thacker S., Adshead D., Fantini C., Palmer R., Ghosal R., Adeoti T., Morgan G., and Stratton-Short S., 2021. Infrastructure for climate action. UNOPS, Copenhagen, Denmark.
- • [iii] World Wildlife 2024. “What is nature-based solutions and how can they help us address the climate crisis?” Retrieved from: https://www.worldwildlife.org/stories/what-are-nature-based-solutions-and-how-can-they-help-us-address-the-climate-crisis Accessed Feb 23, 2024.
- • [iv] De Vera, A. 2023. “What are nature-based solutions for infrastructure?” Global Infrastructure Hub, 27 November 2023. Retrieved from: https://www.gihub.org/articles/what-are-nature-based-solutions-for-infrastructure/ Accessed: February 27, 2024.
- • [v] WEF 2023. “Nature-based solutions in cities are the future of the fight against climate change.” Here’s how to fund them.” World Economic Forum, January 17, 2023. Retrieved from: https://www.weforum.org/agenda/2023/01/climate-change-cities-nature-based-solutions-wef23/ Accessed: February 27, 2024.
- • [vi] WEF 2023. “Nature-based solutions in cities are the future of the fight against climate change.” Here’s how to fund them.” World Economic Forum, January 17, 2023. Retrieved from: https://www.weforum.org/agenda/2023/01/climate-change-cities-nature-based-solutions-wef23/ Accessed: February 27, 2024.
- • [vii] De Vera, A. 2023. “What are nature-based solutions for infrastructure?” Global Infrastructure Hub, 27 November 2023. Retrieved from: https://www.gihub.org/articles/what-are-nature-based-solutions-for-infrastructure/ Accessed: February 27, 2024.