• Climate change is the alteration of the world’s weather systems due to human activity.
  • As our health is closely linked to the environment we live in, climate change is an urgent threat to our health.
  • Climate change affects our health in many ways: directly by the increased intensity and frequency of extreme weather events, air pollution, changes in the spread of infectious diseases, threats to food and drinking water and effects on mental health.
  • Taking action now may help us to avoid some of the more serious health-related impacts of climate change.

Our health is closely linked to the environment we live in. However, our climate is changing, with significant consequences for our health, wellbeing and safety.

Climate change is the alteration of the world’s weather systems brought about by human activity. Without intervention, the changing climate will have far-reaching and catastrophic consequences for our state, the country and other communities around the world. It is an urgent problem with implications at the global, national, community and personal level.

The good news is that there are simple things we can all do now to build our resilience to the effects of climate change and help slow its pace. Many of these actions will also directly benefit our health, the environment and our wallets.

Climate change

Climate change is caused by increases in the amount of greenhouse gases (such as carbon dioxide, methane and nitrous oxide) in the atmosphere which causes the earth’s average temperature to rise. 

Greenhouse gases increase heat being trapped in the atmosphere, raising air and sea temperatures. They are primarily produced through the burning of fossil fuels (like coal) for electricity generation, as well as through the agricultural, mining, land management and transport sectors. 

The effects of climate change are already being felt – air and sea temperatures are increasing and leading to changes in rainfall patterns, more frequent and severe extreme weather events and sea level rise.

Victoria is already warmer and drier, and the CSIRO and Bureau of Meteorology predict that this trend will continue. This means there are likely to be more severe droughts, more heatwaves and increased bushfire activity. 

Although total rainfall is predicted to fall, rainfall events and storms will tend to be more intense, with a greater risk of flash flooding. The risk of severe floods is expected to increase in some parts of Australia, including Victoria, caused by the increased frequency and intensity of heavy rainfall events. Reduced stream flow will also have an impact on Victorian water supplies. 

The majority of Victoria’s population lives within 50 kilometres of the coast. Rising sea levels and storm surges will increase risks of flooding and erosion, endangering life, damaging property and causing ecosystem damage that may affect agriculture, forestry, fisheries and tourism.

Health effects of climate change

Climate change has been described by the World Health Organization as the biggest threat to health in the 21st century – it affects health and wellbeing in many ways: 

  • Directly, by the increased intensity and frequency of extreme weather events (such as heatwaves, floods and bushfires); and
  • Indirectly, through worsening air quality, changes in the spread of infectious diseases, threats to food and water and effects on mental health.

Who is most at risk of health effects due to climate change?

Some people are more vulnerable to the effects of climate change and health: 

  • Children are vulnerable for a number of reasons. For example, their immune systems are not fully developed, putting them at increased risk of infections. Children are also more susceptible to heat stress and dehydration and are more sensitive to exposure to air pollution and smoke from bushfires.
  • Pregnant women are at increased risk of heat stress during heatwaves due to the physiological demands of pregnancy. They and their unborn babies are particularly sensitive to exposure to air pollution and smoke from bushfires.
  • Older people and people with pre-existing medical conditions are more prone to dehydration, heat stress, infections and exacerbation of heart and lung disease.
  • People living in rural and remote areas, Aboriginal and Torres Strait Islander people, people with low socioeconomic status and other vulnerable populations are also at increased risk, in part due to higher levels of underlying disease and limited access to healthcare services. People living in rural or remote communities or along the coast are also at risk from extreme events such as bushfires, droughts, storms and sea level rises.

Staying healthy in a changing climate

There are many simple actions you can take to protect yourself and your family from the impacts of climate change.

Stay healthy in the heat 

Over the last century, average temperatures in Australia have increased and heatwaves have become longer, hotter and more frequent. This trend is expected to continue due to climate change, meaning heatwaves will continue to get longer and hotter. You can stay healthy in the heat by:

  • drinking plenty of water
  • never leaving anyone in a car
  • staying somewhere cool
  • planning ahead
  • checking in on others

Read more about staying healthy in the heat.

Stay safe from mosquito bites

 Warmer average temperatures can mean earlier spring seasons, longer warm seasons, shorter winters, hotter summers and more frequent flooding events. As a result, conditions may become more hospitable for mosquitoes that can carry diseases such as Ross River virus disease and Murray Valley encephalitis.

You can protect yourself and your family from mosquito bites by:

  • wearing loose-fitting clothing when outdoors
  • using mosquito repellents containing DEET or picaridin on exposed skin
  • trying to limit outdoor activity if lots of mosquitoes are about 
  • making sure there is no stagnant water where mosquitoes can breed around your home
  • ensuring your house is properly fitted with mosquito netting or screens. 

Read about more ways to Beat the Bite! 

Avoid risks from floods and minimise health risks in natural waterways

Warmer temperatures and flood conditions can result in a number of health risks to swimmers, including exposure to toxins from blue-green algal blooms, which are expected to become more frequent with climate change.

You can minimise these risks by:

  • avoiding swimming at beaches or in waterways after heavy rainfall events, including floods
  • looking out for any water quality advisories following flooding events or in response to blue-green algal blooms
  • checking the EPA’s Beach Report website for water quality forecasts for 36 Port Phillip Bay beaches and the Yarra Watch website for water quality forecasts at sites along the Yarra River over the summer months.

Learn more about avoiding risks from flooding.

Be a healthy swimmer

Cryptosporidiosis outbreaks associated with swimming pools are expected to become more common due to increased patronage of swimming pools on hot days. Follow these healthy swimming tips to keep the water clean:

  • Do not swim if you have had diarrhoea in the past 14 days
  • Shower and wash thoroughly (especially your bottom) before you swim
  • Wash your hands thoroughly after going to the toilet
  • Avoid swallowing water while swimming
  • Inform the pool operator if you become ill after swimming in the pool.

Get more healthy swimming tips.

Be aware of air quality

Aside from the release of greenhouse gases, burning fossil fuels releases dangerous pollutants such as nitrogen oxides, sulphur dioxide and particulate matter into the air. Ozone is also produced through the interaction of air pollution and sunlight.

Air quality is adversely affected by bushfires, which are expected to increase in frequency and severity due to climate change.

Climate change is expected to increase the length of pollen seasons in some areas and may also result in increased growth and pollen production in some plant species. Pollen can cause allergic reactions such as hay fever in some individuals.

You can minimise your risk of exposure to air pollution and poor quality air by:

  • checking the VicEmergency website or download the app and setting up a ‘watch zone’ to find out about any bushfires (or other extreme events) in your local area 
  • checking the air quality in your area on EPA’s AirWatch website and plan any outdoor activities accordingly
  • during the grass pollen season (October to December), checking the pollen forecast for stations around Victoria on the Melbourne Pollen website or via the Melbourne Pollen Count mobile app.

Read more about air pollution and reducing harm from bushfire smoke.

Keep food safe

Higher temperatures increase the risk of food-borne infections such as gastroenteritis (gastro), caused by increased growth of pathogens such as Campylobacter, Salmonella, and E. coli. You can keep food safe in hot weather by following summer food safety tips

Look after your mental health

Aside from its effects on physical health, climate change may adversely affect the mental health of many Australians. Extreme weather events such as floods, droughts and bushfires can lead to psychological distress due to trauma, illness, loss of loved ones, destruction of property and displacement, and disruption of communities, goods and services.

Getting help and support early can make a big difference to getting the right treatment or assistance for your needs.

Actions to reduce your contribution to climate change

Individual action can make a difference. If we each make changes, together this adds up to collective action that makes an even bigger difference. 

There are plenty of positive things you can do to help slow or reduce climate change, which will also benefit your health, including:

  • Increasing your use of ‘active transport’ (such as walking and cycling) can help to reduce your risk of obesity, diabetes, heart disease, some cancers, and musculoskeletal conditions. 
  • Reducing your reliance on cars by using active transport or public transport will improve air quality, which will help to reduce rates of lung cancer and other lung conditions (including asthma), heart disease and stroke.
  • Eating a diet rich in plant-based foods, including fruits, vegetables, nuts, seeds and whole grains, and with fewer animal-based foods is good for your health and the environment. 
  • As part of a well-balanced, regular diet and a healthy, active lifestyle, eating the recommended amount of fruit and vegetables for men and women every day can help you reduce obesity and maintain a healthy weight, lower your cholesterol and lower your blood pressure. 
  • Reducing your consumption of high kiolojoule processed foods will help to reduce overeating and reduce the environmental impacts associated with these foods. Processed foods are generally high in saturated fat, added sugars or salt, take more energy to produce and are usually packaged, which contributes to landfill waste.
  • Drinking tap water. Victoria has some of the world’s best drinking water. Drinking tap water over bottled water or sugary drinks is better for your health and the environment and it’s a lot cheaper too. 
  • Cooling and heating your home efficiently, will help you remain comfortable all year round, and save on energy.

These benefits are not only important for public health, but also help to reduce demands on the health system.

Where to get help

  • What is climate change?, Department of Sustainability and Environment, Victorian Government. More information here.
  • Climate change impacts on Australia, The Garnaut Climate Change Review. More information here.
  • Climate Change Health Check 2020, Doctors for the Environment Australia. More information here.
  • Climate change – what you can do, Australian Psychological Society. More information here.
  • Measuring the immeasurable: the costs and benefits of climate change, The Garnaut Climate Change Review. More information here.
  • Health effects of climate change in the UK 2012: an update of the Department of Health report [pdf, 5.46mb], Department of Health and Health Protection Agency. UK Government. More information here.

More information

Environmental health

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Environmental health basics

House and garden

Chemical and metal pollutants

Air and water quality

Food quality and safety

Bushfires, floods and extreme weather

Public health and disease control

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This page has been produced in consultation with and approved by: Department of Health and Human Services - RHP&R - Health Protection - Environmental Health Unit

Last updated: July 2019

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