Urban Heat

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GUEST OBSERVATION
Heatwaves have killed more Australians than <a href="https://ama.com.au/ausmed/heatwave-health-warning" target="_blank">road accidents</a>, fires, floods and <a href="https://www.sciencedirect.com/science/article/pii/S1462901114000999" target="_blank">all other natural disasters combined</a>. Although <a href="https://theconversation.com/forget-heatwaves-our-cold-houses-are-much-more-likely-to-kill-us-83030" target="_blank">recent research</a> shows extreme cold is a worry in some parts of Australia, <a href="https://theconversation.com/2018-19-was-australias-hottest-summer-on-record-with-a-warm-autumn-likely-too-112616" target="_blank">our hottest summer on record</a> points to more heat-related deaths to come. The <a href="https://theconversation.com/the-stubborn-high-pressure-system-behind-australias-record-heatwaves-110442" target="_blank">record heatwaves</a> have highlighted the damaging effects of heat stress. Understandably, it’s becoming a major <a href="https://ama.com.au/ausmed/heatwaves-nation%E2%80%99s-deadliest-natural-disaster-0" target="_blank">public health challenge</a>.
The risk of extreme heat events and the adverse impacts on older people has been extensively <a href="https://jech.bmj.com/content/64/9/753.short" target="_blank">discussed in research</a>. Remarkably, very little attention has been paid to the role of urban greenery in reducing heat stress for seniors.
Older people are particularly at risk of heat stress. Pre-existing medical conditions and limited mobility increase their vulnerability. <a href="http://www.cmaj.ca/content/182/10/1053.short" target="_blank">Deaths of older people increase</a> during extreme heat events.
The physical features of urban areas shape the capacity of older adults to engage in many activities when it’s hot. These include vegetation volume and coverage, <a href="https://theconversation.com/building-cool-cities-for-a-hot-future-57489" target="_blank">thermal design</a>, and the extent of shading in public areas and walkways. Increasing urban greenery may offer a way to improve older people’s comfort and social experience.
Ageing adds urgency to greening
It is expected <a href="http://www.un.org/en/sections/issues-depth/ageing/" target="_blank">20% of the global population</a> will be older than 60 by 2050. The figure for Australia <a href="http://www.abs.gov.au/ausstats/abs@.nsf/mediareleasesbyTopic/2CA2134677EF9D03CA257C2E0017283B?OpenDocument" target="_blank">is even higher</a>, at 23%. This means that by 2050 around one in four Australians will be more vulnerable to extreme heat.
Climate change may make the problem worse by <a href="https://www.sciencedirect.com/science/article/pii/S0749379708006867" target="_blank">fuelling even more extreme heat</a> events.
Planning our urban centres to meet the needs of a <a href="https://www.aihw.gov.au/reports/older-people/older-australia-at-a-glance/contents/demographics-of-older-australians" target="_blank">rapidly ageing population</a> is a matter of urgency. Urban greening to reduce their vulnerability to heat stress should be central to this agenda. It can also improve people’s quality of life, reduce <a href="https://www.sciencedirect.com/science/article/abs/pii/S1353829208001172" target="_blank">social isolation and loneliness</a>, and ease the burden on health systems.
An important task is matching the design of communities with the needs of an ageing population. Where older adults live and the quality of their local areas strongly influence their lived experiences. Yet <a href="https://www.propertyobserver.com.au/https://journals.sagepub.com/doi/abs/10.1177/0885412217704649" target="_blank">recent research</a> found the experiences of seniors were often not accounted for in research on neighbourhood design.
What about aged care?
People face choices about where they live as they age. The common choices are to “<a href="https://theconversation.com/for-australians-to-have-the-choice-of-growing-old-at-home-here-is-what-needs-to-change-91488" target="_blank">age in place</a>” or to move into aged care.
Ageing in place includes living in one’s own home or <a href="https://theconversation.com/co-housing-works-well-for-older-people-once-they-get-past-the-image-problem-79907" target="_blank">co-habiting with relatives or friends</a>. Around 90% of Australian seniors <a href="https://www.pc.gov.au/research/completed/housing-decisions-older-australians/housing-decisions-older-australians.pdf" target="_blank">choose this option</a>, with the remainder opting for aged-care facilities.
If one in ten Australian seniors live in aged-care facilities, it is clear these should be designed to minimise heat stress. This isn’t just good for residents; it may also benefit operators by lowering health-care and electricity costs.
While these facilities are purpose-built for older people, many in Australia were built well over a decade ago, when heat stress was not such a large concern. Many more facilities are being built now and will be into the future. Yet it is uncertain whether they are being actively designed to reduce the impacts of heat.
What has our research found?
We recently conducted a focus group to investigate this issue. Participants were senior managers from four large corporate providers of aged care in Australia. We investigated if and how providers try to minimise heat stress through design. We also sought to understand the rationales used to support these design approaches.
Several participants reported on refurbishments that they expect will have cooling effects. Cited design approaches included green roofs and walls, as well as sensory gardens. Other expected benefits included reducing anxiety and improving the mental health of residents.
The fact that single design interventions could produce multiple benefits improved the potential for corporate buy-in. Participants expected that increasing green space and green cover would give their facilities a competitive advantage by attracting more clients and providing a better working environment for staff.
Participants also reported on challenges of including greening in their projects. For example, the benefits of trees were weighed against concerns about roots disrupting footpaths and becoming trip hazards. Species selection was another concern, with fears that inappropriate plants could die and undermine support for greening programs.
Our research suggests that more can be done to make cities hospitable for older people, especially during extreme heat. Urban greening is a start. Encouraging aged-care providers to adopt green infrastructure will have benefits. But we should also consider reforms to planning systems and urban design to better protect older people who choose to age in place.
Claudia Baldwin, Associate Professor, Urban Design and Town Planning, Sustainability Research Centre, University of the Sunshine Coast
Jason Byrne, Professor of Human Geography and Planning, University of Tasmania 
Tony Matthews, Senior Lecturer in Urban and Environmental Planning, Griffith University
This article is republished from <a href="http://theconversation.com" target="_blank">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/how-do-we-save-ageing-australians-from-the-heat-greening-our-cities-is-a-good-start-112613" target="_blank">original article</a>.
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j.ballantyne1990-6AQqhLzZaK

How do we save ageing Australians from the heat? Greening our cities is a good start

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<img src="https://counter.theconversation.edu.au/content/66213/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1">
GUEST OBSERVER
Australian cities are getting hotter.
The many reasons for this include urban densification policies, climate change and social trends such as bigger houses and apartment living, which leave less space for gardens and trees. But some areas and some residents of cities are more exposed to heat than others. 
The concentration of poorer people in hotter places is known as “thermal inequity”. Our recently published research has found this is a real concern on the Gold Coast, one of Australia’s fastest-growing urban regions. 
Urban heat is known to increase rates of injury, death and disease. This is why the federal government recently established an urban greening agenda. 
The central city tends to be hotter than surrounding suburbs and rural areas – the urban heat island effect. Perhaps because of this, much of the research focus has been on the urban core. But what about heat effects in the suburbs?
What is thermal inequity?
Research from North America and Australia shows people who live in greener, leafier suburbs tend to be wealthier. We know that urban greening can cool ambient air temperatures. 
Plentiful street trees, well-designed parks and other types of green space also tend to increase residents’ physical activities and social interactions. This makes greener neighbourhoods healthier and happier. 
Unfortunately, the opposite often occurs in poorer suburbs, meaning residents suffer more heat stress. This is a consequence of fewer street trees, less green space and denser urban design. Our research found thermal inequity is a real concern in Upper Coomera, a suburb in the northern growth corridor of Gold Coast city. 
The Gold Coast has been coping with explosive rates of growth. The population is expected to double to more than 1 million in the next two decades. Growth-management policies are increasing densities in many suburbs. 
On the suburban fringe in places like Upper Coomera, land clearing for development typically removes much of the native vegetation. This in turn increases heat. 
The trend in the Gold Coast, like many cities, is for comparatively disadvantaged people to seek more affordable housing in outer suburbs. Less affluent householders become concentrated in suburbs where housing is packed tightly with fewer trees and less greenery. 
Hotter houses and neighbourhoods lead to residents paying more for electricity to keep cool. Excessive heat can also increase healthcare expenses and reduce productivity.
Research shows residents are struggling
As we explain in the video abstract for our article, we used a mail-back survey of 1,921 households to examine three questions:
1) Are residents aware of climate change?
2) Are residents concerned about climate change?
3) Do residents understand the potential of green infrastructure to help neighbourhoods adapt to climate change? 
We found more than 90% of residents were aware of climate change and almost 70% were concerned about it. Residents living in townhouses were particularly worried. Paradoxically, those living in dwellings with dark roofs were less worried, as were those with larger families.
We also found that more than 90% of respondents had air conditioning. Using statistical analysis, we determined that renters are especially vulnerable to associated energy costs, as are those with kids. 
Interestingly, we found that people living in townhouses were less likely to consider buying energy-efficient devices to lower household energy expenses, as were those with more children. This could be because renters and those with larger families may be struggling financially. 
In sum, we found that more disadvantaged households with less disposable income were living in dwellings that were more vulnerable to heat.
Next, we examined the attitudes of residents to urban greening to help combat heat in their neighbourhood. We found almost two-thirds favoured tree planting. More than half felt local streets lacked shade. 
While 90% of surveyed residents saw that shade was a key benefit of trees, just over half understood that trees can lower air temperatures. Although most residents recognised maintenance costs of trees as a disadvantage, they still favoured more urban greening.
So what can be done?
Our findings have important repercussions for urban policy. As we have previously noted, urban greening has many advantages for climate change adaptation. It is comparatively inexpensive and is politically palatable.
However, higher-density neighbourhoods like Upper Coomera often have less land available for greening. Yards are smaller and verges are typically dominated by on-street parking. 
We advocate for education campaigns about the benefits of urban greening and better urban design guidelines to make it easier for developers to increase neighbourhood greenery. Better knowledge about species selection is needed to reduce maintenance issues.
Urban greening initiatives should also use technologies like permeable paving to limit pavement uplift and capture rainfall on-site. 
Thermal inequity exists but it can be reduced. After all, if urban greenery can benefit all residents, why should the poor miss out?
 
Jason Byrne is associate professor of Environmental Planning, Griffith University and can be contacted <a href="https://theconversation.com/profiles/jason-byrne-6066" target="_blank">here</a>.
Tony Matthews is lecturer in Urban &amp; Environmental Planning, Griffith University and can be contacted <a href="https://theconversation.com/profiles/tony-matthews-234160" target="_blank">here</a>.
Christopher Ambrey is Postdoctoral Research Fellow, The University of Queensland and can be contacted <a href="https://theconversation.com/profiles/christopher-ambrey-243947" target="_blank">here</a>.
All are authors for The Conversation.
<a href="https://theconversation.com/profiles/jason-byrne-6066" rel="author"> </a>
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Urban Heat

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