This applied research project aims to generate a better understanding of the effects of heatwaves on vulnerable population groups in the municipality of The Hague, and suggests ways in which the municipality can help such groups to cope with these heatwaves. The research was performed as a cooperation between The Hague University of Applied Sciences (THUAS), the International Institute of Social Studies (ISS, Erasmus University Rotterdam) and the International Centre for Frugal Innovation (ICFI, Leiden-Delft-Erasmus Universities). Heatwaves constitute an important yet often overlooked part of climate change and their impacts qualify as disasters. According to the World Disasters Report 2020, the three heatwaves affecting Belgium, France, Germany, Italy, the Netherlands, Spain, Switzerland and the UK in the summer of 2019 caused 3,453 deaths.1 2020 was a new record year for the Netherlands because it was the first time that a heatwave included five days in a row during which the temperature reached 35 degrees or more. In addition, 40 degrees was measured for the first time, and periods of tropical days and nights are generally getting longer. Most importantly, this trend is accelerating faster than the climate change models are predicting.2 In addition, the COVID-19 pandemic is compounding the effect of heatwaves, as vulnerable individuals may be reluctant to seek cool spaces out of fear of infection. Already in 2006, the Netherlands ranked near the top of the global disaster index due to the number of excess deaths that could be attributed to the heatwave. In the same year, the EU published the first climate strategy in which heat is recognised as a priority. In 2008, the Netherlands developed its first national heat plan.4 The municipality of The Hague has a municipal climate adaptation strategy and has developed a draft local heat plan in the summer of 2021, which was published in February 2022 . This research was not meant to be and was not set up as an evaluation of the current heat plan, which has not yet been activated. At the level of municipalities and cities, the concept of urban resilience is key. It refers to “the capacity of individuals, communities, institutions, businesses, and systems within a city to survive, adapt, and grow no matter what kinds of chronic stresses and acute shocks they experience”. Heatwaves clearly constitute acute shocks which are rapidly developing into chronic stresses. In turn, heatwaves also exacerbate the chronic stresses that are already there, i.e. existing chronic stresses also lead to greater impact of a heatwave. In other words, there are negative interaction effects. Addressing these effects requires overcoming the silo approach to urban governance, in which different municipal departments as well as other stakeholders (such as the Red Cross, housing corporations, tenants’ associations, care organisations, entrepreneurs etc.) each address different parts of the problem, rather than doing so in an integrated and inclusive manner. The dataset for this study is archived in DANS Easy: https://doi.org/10.17026/dans-xeb-h8uk
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Executive Summary - Temperatures across the Middle East region are predicted to increase by 3°C by 2050 - Warming will be felt more in cities because of the urban heat island (UHI) effect, causing heat-related health problems - City planning and management regimes are often disconnected from disaster risk and resilience building and legislation is lacking - Lacking data and information sharing across multiple levels of governance hamper heatwave warning systems - Urban building projects lead to a soaring demand for cooling systems - Traditional adaptations such as street grid design, wind catchers and mashrabiya screens could be used more - Policy response should include national Heat Health Action Plans that are translated into Local Heat Plans, coordinated and implemented by local governments
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In this opinion piece, we establish some key priorities for evidence-based governance to address the increasing threat of heatwave events in Europe, particularly for human health. According to the European Environment Agency (EEA) [1], Europe is warming faster than the global average. The year 2020 was the warmest year in Europe since the instrumental records began, with the range of anomaly between 2.53˚C and 2.71˚C above the pre-industrial levels. Particularly high warming has been observed over eastern Europe, Scandinavia and the eastern part of the Iberian Peninsula. Climate change-related heatwaves are becoming a significant threat to human health and necessitate early action [2]. While financial resources and technological capacities are crucial to aid (local) governments in adapting to and proactively mitigating the threats posed by heatwaves, they are not enough [3]. Akin to flood responses, European countries must prepare for large-scale evacuations of vulnerable citizens (especially older adults living alone) from their homes. Here, we outline three priorities for Europe in the governance domain. These priorities encompass developing and rolling-out heat-health action plans, a stronger role for European Union institutions in regional heatwave governance, and creating a sense of urgency by developing innovative ways of communicating research findings to relevant policy makers and citizens.
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Research Questions • What are the characteristics of vulnerable populations in The Hague? • What are their needs in order to adapt to heatwaves, and how do they cope? • What are existing sustainable solutions for protecting vulnerable populations? • How can the municipality of The Hague increase urban resilience with regards to heat?
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Our approach is multi-actor and solution driven: • We study global problems with the people directly involved in those problems. • We study what those people do, how they do it, and how their practices can be improved. • This allows us to unpack global governance into more local practices of new and underrepresented actors, and • to develop new collaborative solutions to global problems through communities of practice • using research methods such as interviews, surveys, focus discussion groups, archival work, and citizen science
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Cities are confronted with more frequent heatwaves of increasing intensity discouraging people from using urban open spaces that are part of their daily lives. Climate proofing cities is an incremental process that should begin where it is needed using the most cost-efficient solutions to mitigate heat stress. However, for this to be achieved the factors that influence the thermal comfort of users, such as the layout of local spaces, their function and the way people use them needs to be identified first. There is currently little evidence available on the effectiveness of heat stress interventions in different types of urban space.The Cool Towns Heat Stress Measurement Protocol provides basic guidance to enable a full Thermal Comfort Assessment (TCA) to be conducted at street-level. Those involved in implementing climate adaptation strategies in urban areas, such as in redevelopments will find practical support to identify places where heat stress may be an issue and suggestions for effective mitigation measures. For others, such as project developers, and spatial designers such as landscape architects and urban planners it provides practical instructions on how to evaluate and provide evidence-based justification for the selection of different cooling interventions for example trees, water features, and shade sails, for climate proofing urban areas.
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Older people are often over-represented in morbidity and mortality statistics associated with hot and cold weather, despite remaining mostly indoors. The study “Improving thermal environment of housing for older Australians” focused on assessing the relationships between the indoor environment, building characteristics, thermal comfort and perceived health/wellbeing of older South Australians over a study period that included the warmest summer on record. Our findings showed that indoor temperatures in some of the houses reached above 35 °C. With concerns about energy costs, occupants often use adaptive behaviours to achieve thermal comfort instead of using cooling (or heating), although feeling less satisfied with the thermal environment and perceiving health/wellbeing to worsen at above 28 °C (and below 15 °C). Symptoms experienced during hot weather included tiredness, shortness of breath, sleeplessness and dizziness, with coughs and colds, painful joints, shortness of breath and influenza experienced during cold weather. To express the influence of temperature and humidity on perceived health/wellbeing, a Temperature Humidity Health Index (THHI) was developed for this cohort. A health/wellbeing perception of “very good” is achieved between an 18.4 °C and 24.3 °C indoor operative temperature and a 55% relative humidity. The evidence from this research is used to inform guidelines about maintaining home environments to be conducive to the health/wellbeing of older people. Original publication at MDPI: https://doi.org/10.3390/atmos13010096 © 2022 by the authors. Licensee MDPI.
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While the optimal mean annual temperature for people and nations is said to be between 13 °C and 18 °C, many people live productive lives in regions or countries that commonly exceed this temperature range. One such country is Australia. We carried out an Australia-wide online survey using a structured questionnaire to investigate what temperature people in Australia prefer, both in terms of the local climate and within their homes. More than half of the 1665 respondents (58%) lived in their preferred climatic zone with 60% of respondents preferring a warm climate. Those living in Australia's cool climate zones least preferred that climate. A large majority (83%) were able to reach a comfortable temperature at home with 85% using air-conditioning for cooling. The preferred temperature setting for the air-conditioning devices was 21.7 °C (SD: 2.6 °C). Higher temperature set-points were associated with age, heat tolerance and location. The frequency of air-conditioning use did not depend on the location but rather on a range of other socio-economic factors including having children in the household, the building type, heat stress and heat tolerance. We discuss the role of heat acclimatisation and impacts of increasing air-conditioning use on energy consumption.
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The question of how to design climate-resilient landscapes plays a major role in the European projects in which the green university has been involved, such as Future Cities and F:ACTS!. These are projects in which various European organizations, government authorities and universities have joined forces to find an answer to climate-related issues. Van Hall Larenstein also collaborates with Almere, a relatively new Dutch municipality that is changing rapidly and that prioritizes climate resilience in its development. Over the years there has been a clear development in climate-adaptive planning, both in education and in practice.
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The liveability of cities worldwide is under threat by the predicted increase in intensity and frequency of heatwaves and the absence of a clear spatial overview of where action to address this. Heat stress impairs vital urban functions (Böcker and Thorsson 2014), hits the local economy (Evers et al. 2020), and brings risks for citizens’ health (Ebi et al. 2021). The ongoing densification of cities may escalate the negative consequences of heat, while rising climate adaptation ambitions require new pathways to (re)design public places for a warmer climate. Currently, policy makers and urban planners rely on remote sensing and modelling to identify potential heat stress locations, but thermal comfort models alone fail to consider socio-environmental vulnerabilities and are often not applicable in different countries (Elnabawi and Hamza 2020).In the Cool Towns Interreg project, researchers collaborated with municipalities and regions to model urban heat stress in nine North-Western European cities, to find vulnerabilities and to measure on the ground (see Spanjar et al. 2020 for methodology) the thermal comfort of residents and the effectiveness of implemented nature-based solutions. Using the Physiological Equivalent Temperature (PET) index, several meteorological scenarios were developed to show the urban areas under threat. The PET maps are complemented by heat vulnerability maps showing key social and environmental indicators. Coupled with local urban planning agendas, the maps allowed partner cities to prioritize neighbourhoods for further investigation. To this end, community amenities and slow traffic routes were mapped on top of the PET maps to identify potential focus areas.A comparative analysis of the collated maps indicates certain spatial typologies, where vital urban activities are often influenced by heat stress, such as shopping areas, mobility hubs, principal bicycle and pedestrian routes. This project has resulted in the development of a multi-level Thermal Comfort Assessment (TCA), highlighting locations where vulnerable user groups are exposed to high temperatures. Standardized for European cities, it is a powerful tool for policy makers and urban planners to strategically identify heat stress risks and prioritize locations for adapting to a changing climate using the appropriate nature-based solutions.
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