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      • Reflections on infrastructure, Town and Country planning and intimations of SIA in the late 1970s and early 1980s
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      • Introduction
      • Risk Assessment and Impact Assessment : A perspective from Victoria, Australia
      • The New and Adaptive Paradigm Needed to Manage Rising Coastal Risks
      • Reflections on Using Risk Assessments in Understanding Climate Change Adaptation Needs in Te Taitokerau Northland
      • Values-Based Impact Assessment and Emergency Management
      • Certainty about Communicating Uncertainty: Assessment of Flood Loss and Damage
      • Improving Understanding of Rockfall Geohazard Risk in New Zealand
      • Normalised New Zealand Natural Disaster Insurance Losses: 1968-2019
      • Houston, We Have a Problem - Seamless Integration of Weather and Climate Forecast for Community Resilience
      • Innovating with Online Data to Understand Risk and Impact in a Data Poor Environment
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Adapting to Climate Change on Scale: Addressing the Challenge and Understanding the Impacts of Asia Mega-cities

Tom Burkitt, WSP New Zealand Limited
Photo credit: Nathan Ergang

Introduction

The  world is urbanising at an astonishing rate [1]. As our climate and ecological emergency deepens [2] and as cities ascend to a position of economic and political influence that exceeds that of the State [3], we must accelerate the uptake of solutions that reduce emissions and resource consumption in cities (especially mega-cities) if we are to meet our global obligations under the Paris Agreement [4] and restrict global heating to 2 degrees [5].

It is a difficult journey. The concentrated use of resources, and release of emissions by cities can wreak havoc on the atmosphere, resources, and the environment, but they can also be a source of environmental good and critical innovation. So, while alarming and overwhelming, it is in our cities that we must place our hope.

This short paper highlights the impacts and vulnerabilities of mega-cities with a focus on Asia and presents 6 emerging ideas for action that could help accelerate sustainable development of future mega-cities.
Find out more
The Possible
www.the-possible.com
C40 Cities Network
www.c40.org
Global Covenant of Mayors
www.globalcovenantofmayors.org
UN Sustainable Cities
www.un.org/sustainabledevelopment/cities
Circular Cities
www.ellenmacarthurfoundation.org/our-work/activities/circular-economy-in-cities
Global Centre on Adaptation
www.gca.org

Asian Mega-cities: Scale and Impacts

Mega-cities are urban agglomerations with populations exceeding 10 million. It was once thought that this threshold was almost unattainable, yet as of 2018 the worldwide ‘club’ of mega-cities has grown to 33, of which 20 are in Asia [6].
Tokyo, Beijing, Delhi, Bangkok, Manila and Jakarta are notable examples of megacities in Asia with populations ranging from 11 to 24 million, and they are all growing.

According to the World Economic Forum, just under half of all Asians live in cities, compared to 82% of Americans and 74% of Europeans. Asia is now undergoing a very rapid and large-scale rural-to-urban migration. Asia is projected to have two-thirds of the world’s megacities by 2025, and while greenhouse gas emissions on a per capita basis can be lower in dense urban areas, cities are still responsible for over two-thirds of emissions worldwide.

What happens in Asia needs to concern us all. Not only is the region a key trading partner for us, but it is a region whose emissions and impact extend beyond its geography and indirectly impact our communities.

Megacities impact the environment and contribute to greenhouse gas emissions in many ways within their municipal boundaries and throughout their supply chain. They consume energy and resources for construction and operation of buildings and infrastructure, create pollution in the air, rivers, and seas, and they generate enormous amounts of organic and inorganic waste. A troubling statistic on pollution, for instance, for Asia is that China, Indonesia, Philippines, Thailand, and Vietnam are dumping more plastic into oceans than the rest of the world combined.

The mega-cities of Asia are highly exposed and vulnerable to the effects of climate change. Recent studies suggest that the exposure may have been underestimated for Asian cities. For instance Jakarta and Bangkok are literally sinking under the weight of their populations, and approximately 70 percent of people worldwide living on land vulnerable to sea level rise and coastal inundation are in eight Asian countries: China, Bangladesh, India, Vietnam, Indonesia, Thailand, the Philippines, and Japan.
Table 1: Current population below the elevation of an average annual flood in 2050 (top six countries) [7]
Picture
"The threat is concentrated in coastal Asia and could have profound economic and political consequences within the lifetimes of people alive today"
The direct impacts of increased temperatures, higher storm intensities, and coastal inundation are amongst the critical threats, but the indirect impacts of climate hazards on critical resources, food, and energy supply and management are other insidious issues for which many cities are woefully underprepared.
"What if we set the world on fire, not by burning fossil fuels, but by our burning desire to understand our environment?"
Laura Tenenbaum, Former Senior Science Editor for NASA’s Global Climate Change website at NASA’s Jet Propulsion Laboratory

Taking Action

So, what can we do about it? The answer is many things and too many to address here. Instead, here are 6 ideas that are gaining traction and are being considered by planners, engineers, and municipal authorities responsible for urban development in Asian megacities.

#1: Applying a focus on climate resilience as part of strategic and other impact assessment

Climate resilience requires us to consider both mitigation and adaptation, and we need to ensure that we don’t take maladaptive steps or make decisions that lock us in to approaches that we’ll regret later.
Picture
Figure 1: Climate Resilience as an outcome of coordinated and synergistic activities addressing mitigation and adaptation on scale. [8]
By adopting a holistic climate resilience framework and organising action and investment under it, leading cities are making progress and getting organised. They are identifying synergies, the win-win situations, when actions reduce both carbon emissions and climate risks. These cities understand the trade-offs and can mitigate any threat of malinvestment where actions can be undone or rendered less effective by the effects of climate change if they are not sufficiently resilient. They are also capable of piggybacking opportunities and identifying actions that are coupled in their design or implementation and where additional mitigation or adaptation actions can be added at a small marginal cost. Certainly, taking such an integrated approach to mitigation and adaptation is efficient and is proving effective.

#2: Understanding and measuring the risk to inform strategies

Risk is a measure and not a nebulous or arbitrary concept. It is expressed as a function of a) hazard intensity and probability, b) the exposure of things we care about to the hazards, and c) the vulnerability of the exposed elements.

Each of these components of risk are highly variable in space and time, and this makes it tricky to understand and model. However, there are many sophisticated modelling frameworks for risk, and cities can also move forward effectively by adopting qualitative assessments of risk in order that they identify the high priority areas to focus on.

A common way to visualise risk is as a Venn diagram where risk is the intersection of hazard, vulnerability, and exposure.
Picture
Figure 2: The risk function and its common visual representation with examples of actions to mitigate climate risk. [9]
Cities that take a risk-based approach to their impact assessment processes and to decision-making for spatial planning and infrastructure development are in a better position to identify risk hot-spots and to prioritise investment in adaptation. By applying multi-hazard risk assessment some cities are proving more likely to develop effective policies to adapt exposed communities, limit further exposure, and reduce overall vulnerability.

#3: Joining a coalition of the willing

Everyone is learning. Collaboration amongst cities is critical, and the new mega-cities need to harvest knowledge from other cities that are moving forward with climate action.

It is very encouraging to observe the emergence over the past 10 years of strong city networks building capacity and driving implementation of ambitious climate action plans. For instance, the C40 network [10] is a global network of 96 cities, including 26 megacities, that are firmly committed to transition to a net zero economy. These cities represent 25% of global GDP and over 700 million citizens. There is good news with 53 of the 96 cities having peaked in their emissions before the end of 2020. Most will be net zero by 2045, and this network of cities is growing. Other active and determined networks include the Global Covenant of Mayors [11] and the Asian Cities Climate Change Resilience Network [12].

#4: Unlocking innovation to decarbonise the supply chain

Consider the ecological footprint and emissions, not only within the city limits, but also the emissions and impacts at source of all materials, products and goods it imports.

The role of municipal authorities is to lead, enable, and inspire sustainable development and transition to a low carbon economy, and it is encouraging that cities are now beginning to adopt aggressive sustainable procurement policies that reduce environmental impact and emissions throughout the supply chain, but there are huge an untapped opportunities to do far better in this regard.

#5: Identifying shift projects with transition engineering

Transition Engineering [13] is a powerful and straightforward evidence-based approach that engineers can learn easily and use to help shape future cities. It takes a systems perspective to plan changes to today's engineered systems that ‘downshift’ the fossil fuel-based energy that they require. Effective transition must involve the whole of society, economy, law, ecology, infrastructure, and energy and material supply chains.

Application of the approach by engineers responsible for city master-planning planning and infrastructure development would be a very powerful lever. The Interdisciplinary Transition, Innovation, Management and Engineering (InTIME) Methodology central to Transition Engineering generates new opportunities for shift projects with the mission of achieving the 80% fossil fuel production decline required to meet global warming mitigation targets.

#6: Embracing the Adaptive Circular City Framework [14]

What if we could:
Picture
The emerging framework for Adaptive and Circular Cities [15] is powerful. Coupling adaptation and circularity has the potential to unlock innovation on scale and create sustainable and resilient urban environments. In their mission to reduce GHG emissions and minimise waste, several cities are beginning to design their systems around a circular economy to maximise value extracted from products and infrastructure whilst in use and to ensure materials and parts are recovered and regenerated for further use. This approach stimulates the economy and slows over-extraction of resources and over production.

What does this mean for Impact Assessment practitioners?

There’s a lot of work to do, and impact assessment practitioners have a vital role to play as advocates of these and other approaches that drive sustainable urban development on a large-scale.

Whilst many of us are involved already in understanding and mitigating the impacts of rapid urbanisation, we must also consider the impacts (both positive and negative) of large-scale plans and investments made at pace to reduce emissions and adapt our cities to climate change.

For instance, large coastal reclamation projects now planned or underway in many coastal Asian cities are designed to create more land and mitigate against coastal inundation in the long-term, but the environmental impact of material extraction at source, deposition, and transport is enormous and often under-estimated.

Another example of a dramatic response to climate change, is Indonesia’s decision to establish a new city on Borneo to replace Jakarta as it’s State capital. Whilst envisioned as a smart, green, and sustainable alternative, the direct and indirect impacts on the environment and society will be extraordinarily hard to mitigate at the pace the government is intending to move.

Such transformation should be informed by rigorous analysis of the impacts of these well-intended investments, but most cities are paying too little attention to the environmental, social, and cultural impacts of taking rapid action to reduce emissions and build their resilience to natural hazards. This presents an opportunity for both scholars and practitioners of impact assessment to explore the pros-and-cons of mitigation and adaptation in order to support better decision-making in our future cities.
Download Article as PDF
References:

[1] Our World in Data – Urbanisation (https://ourworldindata.org/urbanization)

[2] World Economic Forum Global Risks Report (https://www.weforum.org/reports/the-global-risks-report-2020)

[3] Barber, B.R. (2014) “If Mayors Ruled the World”, Yale University Press

[4] What is the Paris Agreement? (https://unfccc.int/process-and-meetings/the-paris-agreement/what-is-the-paris-agreement)

[5] NASA (2019) “A Degree of Concern: Why Global Temperatures Matter” (https://climate.nasa.gov/news/2878/a-degree-of-concern-why-global-temperatures-matter)

[6] UN World Urbanisation Prospects 2018 (https://population.un.org/wup/Publications/)

[7] Kulp, S.A., Strauss, B. H. New elevation data triples estimates of global vulnerability to sea-level rise and coastal flooding. Nat Commun 10, 4844 (2019)

[8] Source: WSP New Zealand Limited, 2020.

[9] IPCC Special Report on the on the Ocean and Cryosphere in a Changing Climate (https://www.ipcc.ch/srocc/)

[10] C40 Annual Report 2019 (https://c40-production-images.s3.amazonaws.com/other_uploads/images
/2574_C40_2019_Annual_Report.original.pdf?1587634742
)

[11] www.globalcovenantofmayors.org

[12] https://www.acccrn.net/

[13] Krumdieck, S. (2020) “Transition Engineering: Building a Sustainable Future”, Routledge Press

[13] https://www.ellenmacarthurfoundation.org/our-work/activities/circular-economy-in-cities
 
[15] http://www.adaptivecircularcities.com/towards-adaptive-circular-cities/
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    • Issue #14 Impact assessment for infrastructure development >
      • Impact assessment for infrastructure development - an introduction
      • Place Matters: The importance of geographic assessment of areas of influence in understanding the social effects of large-scale transport investment in Wellington
      • Unplanned Consequences? New Zealand's experiment with urban (un)planning and infrastructure implications
      • Reflections on infrastructure, Town and Country planning and intimations of SIA in the late 1970s and early 1980s
      • SIA guidance for infrastructure and economic development projects
      • Scoping in impact assessments for infrastructure projects: Reflections on South African experiences
      • Impact Assessment for Pacific Island Infrastructure
    • Issue #13 Health impact assessment: practice issues >
      • Introduction to health impact assessment: practice issues
      • International Health Impact Assessment – a personal view
      • Use of Health Impact Assessment to develop climate change adaptation plans for health
      • An integrated approach to assessing health impacts
      • Assessing the health and social impacts of transport policies and projects
      • Whither HIA in New Zealand….or just wither?
    • Issue #12 Risk Assessment: Case Studies and Approaches >
      • Introduction
      • Risk Assessment and Impact Assessment : A perspective from Victoria, Australia
      • The New and Adaptive Paradigm Needed to Manage Rising Coastal Risks
      • Reflections on Using Risk Assessments in Understanding Climate Change Adaptation Needs in Te Taitokerau Northland
      • Values-Based Impact Assessment and Emergency Management
      • Certainty about Communicating Uncertainty: Assessment of Flood Loss and Damage
      • Improving Understanding of Rockfall Geohazard Risk in New Zealand
      • Normalised New Zealand Natural Disaster Insurance Losses: 1968-2019
      • Houston, We Have a Problem - Seamless Integration of Weather and Climate Forecast for Community Resilience
      • Innovating with Online Data to Understand Risk and Impact in a Data Poor Environment
    • Impact Connector #11 Climate Change Mitigation, Adaptation, and Impact Assessment: views from the Pacific >
      • Introduction
      • Climate change adaptation and mitigation, impact assessment, and decision-making: a Pacific perspective
      • Climate adaptation and impact assessment in the Pacific: overview of SPREP-sponsored presentations
      • Land and Sea: Integrated Assessment of the Temaiku Land and Urban Development Project in Kiribati
      • Strategic Environmental Assessment: Rising to the SDG Challenge
      • Coastal Engineering for Climate Change Resilience in Eastern Tongatapu, Tonga
      • Climate-induced Migration in the Pacific: The Role of New Zealand
    • Impact Connector #10 Climate Change Mitigation and Adaptation >
      • Introduction
      • Is a “just transition” possible for Māori?
      • Adapting to Climate Change on Scale: Addressing the Challenge and Understanding the Impacts of Asia Mega-Cities
      • How responding to climate change might affect health, for better or for worse
      • Kanuka, Kereru and carbon capture - Assessing the effects of a programme taking a fresh look at the hill and high country land resource
      • Wairoa: Community perceptions of increased afforestation
      • Te Kākahu Kahukura Ecological Restoration project: A story within a story
    • Issue #9 Impacts of Covid-19 >
      • Introduction to Impact Connector Issue 9 – Impact assessment and Covid 19
      • Covid-19 fast-track consenting: climate change legacy key to success
      • Tourism – the long haul ahead
      • Making sense of the impact of Covid-19: planning, politics, and the public good
    • Issue #8 Social Impact Assessment >
      • Challenges for Social Impact Assessment in New Zealand: looking backwards and looking forwards
      • Insights from the eighties: early Social Impact Assessment reports on rural community dynamics
      • Impact Assessment and the Capitals Framework: A Systems-based Approach to Understanding and Evaluating Wellbeing
      • Building resilience in Rural Communities – a focus on mobile population groups
      • Assessing the Impacts of a New Cycle Trail: A Fieldnote
      • The challenges of a new biodiversity strategy for social impact assessment (SIA)
      • “Say goodbye to traffic”? The role of SIA in establishing whether ‘air taxis’ are the logical next step in the evolution of transportation
    • Issue #7 Ecological Impact Assessment >
      • The future of Ecological Impact Assessment in New Zealand
      • Ecological impact assessment and roading projects
      • EcIA and the Resource Management Act
      • Professional Practice and implementation of EcIA
      • EcIA in the Marine Environment
    • Issue #6 Landscape Assessment >
      • Introduction
      • Lives and landscapes: who cares, what about, and does it matter?
      • Regional Landscape Inconsistency
      • Landscape management in the new world order
      • Landscape assessment and the Environment Court
      • Natural character assessments and provisions in a coastal environment
      • The Assessment and Management of Amenity
      • The rise of the THIMBY
      • Landscape - Is there a common understanding of the Common?
    • Issue #5 Cultural Impact Assessment >
      • Introduction
      • Potential of Cultural Impact Assessment
      • The Mitigation Dilemma
      • CIA and decision-making
      • Insights and observations on CIA
      • Achieving sustainability through CIA
      • CIA - Enhancing or diminishing mauri?
      • Strategic Indigenous Impact Assessment?
    • Issue #4 Marine Environment >
      • Introduction
      • Iwi, Impact Assessment and Marine Environment
      • Sea-Bed Mining Application in Taranaki
      • The wreck of the MV Rena
      • High Court RMA Controls on Fishing
      • Initiatives in the Pacific Islands
      • SEA in an NZ context
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