Building resilience to Australian flood disasters in the face of climate change

Abstract

Building resilience to environmental disasters requires transformative action to tackle climate change and health inequities Unprecedented floods in Northern Rivers, NSW, and in south-east Queensland have caused deaths and devastation and disrupted health and other services and facilities. Deaths from drowning, injuries, poisonings and infections are typically the immediate health impacts of floods.1 However, these direct impacts are only the tip of the health iceberg. Flood-affected communities in Australia and other parts of the world have experienced long-lasting mental health effects, such as depression, anxiety and post-traumatic stress disorder.2, 3 The Australian dilemma, praying for Lismore. Rick Cochrane, 2021. ◆ Importantly, flooding exacerbates health inequities in affected populations.2 In a previous flooding event that affected north-eastern NSW in 2017, Aboriginal communities and people from low socio-economic households were more likely to have their homes flooded and to be displaced, which exacerbated their mental health risk.5 Furthermore, people with a disability were more likely to have their homes flooded and be evacuated, still be displaced 6 months after the event, and experience disrupted access to food, support networks, health care and social services.6 Floods are generally associated with increased incidence of vector-, food- and water-borne diseases due to increased abundance of mosquitoes, water and food contamination, and compromised hygiene and sanitation services.1, 7 For example, gastrointestinal disease and leptospirosis cases were recorded after floods in England and Hawaii.1 River flow and height (which are surrogates of flooding) were positively associated with Ross River virus disease spread by mosquitoes in the Murray River in eastern Australia.8 Ongoing rain and flooding in eastern Australia provide suitable environmental conditions for the spread of mosquito-borne flaviviruses, which have recently caused several cases of acute encephalitis in animals and humans, including 42 human cases of Japanese encephalitis in NSW, Queensland, South Australia and Victoria (as at 18 May 2022).9 There has been widespread criticism of the handling of the flooding crisis in NSW after residents were left stranded on roofs in Lismore during the record floods of February 2022. An independent inquiry on the causes of, and factors contributing to, the frequency, intensity, timing and location of floods, as well as the preparation and planning for floods by the agencies and the community, has been announced by the NSW Government.10 This inquiry will scrutinise not only the emergency response, but also the transition from incident response to recovery, and consider land use planning and building standards in flood prone areas, appropriate action to adapt to future flood risks, and coordination and collaboration between all levels of government. Heavy rainfall, river floods, extreme heat and fire weather events are all projected to increase throughout Australia.11, 12 Although we cannot fully attribute single weather events to climate change, extreme events such as the recent floods in NSW and Queensland, or the devastating 2020 Black Summer bushfires in eastern Australia, are projected to increase in frequency, intensity and duration for global warming scenarios from 1.5°C to 4°C.11 The recent report of the Intergovernmental Panel on Climate Change (IPCC) on impacts, adaptation and vulnerability12 identified the inability of institutions and governance systems to manage climate risks, such as those posed by floods, as a key risk for Australia. In this context of intensifying and more frequent extreme events, strengthening the long term resilience of health and social services and local communities to climate disasters becomes crucial. The IPCC report also highlighted the value of diverse knowledges including scientific, local and Indigenous knowledges in understanding and responding to climate risks. Resilience is not only the ability to maintain essential function, identity and structure but also the capacity for transformation.12 Building back better should not be interpreted as just engineering interventions of rebuilding residential areas in floodplains or bushfire prone areas with stronger flood- and fire-resistant structures, but as an opportunity for more fundamental structural changes in our health system, society and economy that will strengthen community cohesion and resilience. In Australia, effective long term disaster management and resilience across multiple sectors is strongly influenced by geography, and should be informed by meaningful engagement with rural health services and Aboriginal and Torres Strait Islander and other local communities in rural and urban areas.14 The coronavirus disease 2019 (COVID-19) pandemic and underlying NCDs present a challenge for disaster and health systems, especially when public health and health care infrastructure is inaccessible or damaged. People with cardiovascular and respiratory diseases, unstable diabetes, or renal and mental health diseases, and those who are undergoing cancer treatment are at greatest risk.15 Displacement and temporary relocation of families in crowded evacuation centres increase the risk of transmission of respiratory diseases, including COVID-19. Fundamental shifts in preparedness planning are required to ensure health, safety, and smooth operations during emergencies in the context of the COVID-19 pandemic.16 This includes revising evacuation plans, shelter design and staffing, health care operations for evacuees, and public health messaging. Developing effective public health messaging for floods during the pandemic is critical and requires careful planning and familiarity with the needs and characteristics of the affected communities.16 The converging impacts of climate change, extreme events, COVID-19, NCDs, socio-economic inequities, population ageing and urban growth require an integrated whole-of-system response. This should focus on flood- and fire-resilient land-use planning that will reduce community exposure to climate-related risks and systemic vulnerability in the long term,17 improved housing conditions for low socio-economic households, agile and high value health care, strengthened public health surveillance and emergency warning systems, and a net-zero carbon economy. The response of health professionals to COVID-19, catastrophic bushfires and floods over the past 2 years has been heroic, but it is not sustainable in the long run. Extreme events, pandemic fatigue, overstretched clinical services, spiralling demand for mental health services, and staff burnout could drive the health care workforce to collapse.20 Beyond the health system, the COVID-19 pandemic has altered the social capital (ie, community attachment, solidarity and social trust) and exposed health inequities in our communities.21 Health practitioners have the opportunity to contribute their expertise to help reduce the health consequences of climate disasters across the prevention, preparedness, response and recovery phases of disaster management.22 Disaster preparedness and recovery plans should be developed in partnership with disability organisations and community grassroots, including Aboriginal and Torres Strait Islander communities, to ensure that scientific knowledge is combined with local knowledge gained from experience and built from the ground up.23 Proactive adaptation through better planning in the built environment is essential. The initial focus on recovery should shift towards long term planning of more resilient urban and rural infrastructure, housing, digital communications, and health and social services. In addition, effective prevention of infectious diseases outbreaks related to extreme weather events requires strengthened public health surveillance and integrated early warning systems.24 Similarly, early detection and treatment of mental health problems triggered or exacerbated by extreme events is essential to prevent impacts that could be prolonged over years.2 Response and recovery efforts during and after climate disasters, such as the recent floods in NSW and Queensland are essential, but long term planning and public health prevention are equally or even more important in the face of converging health and climate crises. To build this urgently needed long term resilience (Box), we call for: NCD = non-communicable disease. ◆ We acknowledge the HEAL (Healthy Environments And Lives) National Research Network, which receives funding from the National Health and Medical Research Council (Grant No. 2008937). Open access publishing facilitated by Australian National University, as part of the Wiley - Australian National University agreement via the Council of Australian University Librarians. No relevant disclosures. Not commissioned; externally peer reviewed.

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