Six Climate and Health Measures Could Save 1.6 Million Lives Annually, WHO Report Finds

GENEVA, Nov 4: Six proven climate and health interventions could prevent approximately 1.6 million deaths every year while generating trillions of dollars in economic benefits, according to a new report released by the World Health Organization (WHO).

The assessment highlights the growing connection between environmental conditions and public health, warning that climate change is increasing risks to human health across different regions.

The report, titled ‘Global Benefits and Costs of Prioritized Actions on Climate Change and Health’, examines the potential impact of expanding six interventions recommended by the WHO.

These include heat-health warning systems, climate-resilient drinking water services, basic sanitation, hygiene and handwashing facilities, cleaner household fuels and technologies, and more efficient fossil fuel pricing policies.

According to the organisation, implementing these measures on a global scale could prevent 1.6 million deaths annually, generate approximately USD 3.9 trillion in economic welfare benefits and deliver an additional USD 5.4 trillion in fiscal benefits every year.

The proposed interventions could also help avoid 16.7 billion tonnes of carbon dioxide emissions, equivalent to approximately 31 per cent of annual global greenhouse gas emissions when emissions from land use and related changes are excluded.

The WHO said the findings demonstrate that protecting public health and addressing climate change do not have to be separate policy objectives.

Instead, investments in preventive healthcare, clean energy, sanitation and climate preparedness can deliver multiple benefits for people, economies and the environment.

Climate Crisis Increasingly Becoming a Public Health Concern

Climate change has emerged as a major challenge for healthcare systems because rising temperatures, changing weather patterns and environmental disruptions can affect human health in several ways.

Extreme heat can increase the risk of dehydration, heat exhaustion and heatstroke, particularly among older people, children, outdoor workers and individuals with existing health vulnerabilities.

Changes in rainfall patterns and water availability can also affect access to safe drinking water and sanitation.

Flooding, droughts and other climate-related emergencies may damage healthcare infrastructure, disrupt medical supplies and increase the risk of infectious diseases.

Air pollution and the continued dependence on polluting fuels can further contribute to respiratory and cardiovascular health problems.

The WHO has repeatedly emphasised that the health consequences of climate change are not limited to individual emergencies. They can place sustained pressure on hospitals, healthcare workers and public health budgets.

WHO Director-General Tedros Adhanom Ghebreyesus said the climate crisis is also a health crisis, but much of the resulting damage can be prevented through measures that are already available.

He called on governments to place health protection at the centre of climate policies and make greater use of affordable interventions supported by scientific evidence.

The report was released ahead of COP31, where governments are expected to discuss their climate commitments and approaches to reducing environmental risks.

Six Interventions Identified by the WHO

The WHO assessment identifies six measures that could deliver substantial health and economic benefits if implemented more widely.

1. Heat-health warning systems

Heat-health warning systems are among the most important interventions identified in the report.

These systems help authorities identify periods of dangerous temperatures and communicate timely warnings to communities.

Early alerts allow hospitals, emergency services and local administrations to prepare for extreme heat conditions.

Public awareness campaigns can also advise people to remain hydrated, avoid unnecessary outdoor exposure during peak temperatures and take precautions when working in hot environments.

Such systems are particularly important for older people, children, people with chronic illnesses and workers exposed to high temperatures.

According to the WHO assessment, heat-health warning systems could generate approximately USD 835 in benefits for every USD 1 invested.

The report identifies them as one of the most cost-beneficial interventions because they can build on existing public health and emergency communication infrastructure.

2. Climate-resilient drinking water services

Access to safe drinking water is essential for preventing infections and maintaining good health.

Climate change can threaten water availability through droughts, extreme rainfall, flooding and damage to water infrastructure.

When drinking water systems become contaminated or unreliable, communities face increased risks of waterborne diseases and other health problems.

The WHO recommends strengthening water supply infrastructure so that it can withstand changing environmental conditions.

This includes protecting water sources, improving treatment facilities and ensuring that drinking water remains accessible during climate-related emergencies.

Resilient systems can reduce the risk of contamination and help communities maintain essential services even during severe weather events.

3. Basic sanitation services

Improving sanitation is another important component of the WHO’s recommended strategy.

Inadequate sanitation can contribute to the spread of infectious diseases, particularly in communities where large populations depend on poorly maintained facilities.

Flooding can also damage sanitation infrastructure and spread contaminated water into residential areas.

Investments in reliable sanitation services can reduce exposure to harmful pathogens and improve public health conditions.

The WHO has highlighted the importance of ensuring that sanitation infrastructure is designed to withstand climate-related disruptions.

Local governments and public health agencies must also maintain sanitation facilities and establish effective waste management systems.

4. Hygiene and handwashing facilities

Access to proper hygiene facilities can help prevent the transmission of several infectious diseases.

Handwashing with soap is a simple but important public health measure that reduces the spread of harmful microorganisms.

However, millions of people continue to face difficulties accessing reliable water supplies and suitable hygiene facilities.

The WHO has called for greater investment in handwashing infrastructure in homes, schools, healthcare facilities and public institutions.

Improving hygiene access can strengthen disease prevention efforts, particularly in areas where healthcare services are limited.

The organisation believes that combining sanitation improvements with hygiene education can provide lasting health benefits.

5. Cleaner household fuels and technologies

Household air pollution remains an important health concern in communities that rely on polluting fuels and inefficient technologies for cooking and heating.

Smoke produced by traditional cooking methods can expose families to harmful pollutants inside their homes.

Women and children may face particularly high exposure in households where cooking activities take place in poorly ventilated spaces.

Long-term exposure to household air pollution is associated with respiratory and cardiovascular diseases and other serious health conditions.

The WHO recommends expanding access to cleaner household fuels and modern cooking technologies.

Improved alternatives can reduce indoor pollution, lower health risks and contribute to broader environmental objectives.

Greater access to clean household energy is especially important for low-income communities, where traditional fuels may remain the most accessible option.

6. Efficient fossil fuel pricing policies

The sixth intervention involves improving the way governments price fossil fuels.

According to the WHO report, inefficient subsidies and inadequate taxation can encourage the continued consumption of polluting fuels.

More efficient pricing policies could support cleaner energy transitions while generating additional public revenue.

The organisation estimates that such policies could prevent approximately 1.2 million deaths annually and generate around USD 3 trillion in economic welfare benefits, alongside USD 5.4 trillion in fiscal benefits.

The report identifies this intervention as having the largest overall economic and fiscal potential among the six measures.

However, the WHO also stresses the importance of designing policies carefully so that vulnerable households are protected from disproportionate financial burdens.

Trillions of Dollars in Potential Economic Benefits

The WHO report highlights that climate-related health interventions can generate economic returns far beyond their initial implementation costs.

According to the assessment, scaling up the six measures could deliver USD 3.9 trillion in annual economic welfare benefits.

An additional USD 5.4 trillion in fiscal benefits could be generated through the implementation of the recommended policies.

The organisation also estimates that, across five of the interventions, every USD 1 invested could produce approximately USD 24 in benefits.

These returns reflect improvements in public health, reduced premature mortality, environmental protection and wider economic productivity.

Preventing illness and premature deaths can reduce pressure on healthcare systems and allow more people to participate in education, employment and economic activities.

Cleaner household energy can also reduce the health burden associated with indoor air pollution.

Similarly, better sanitation and drinking water services can prevent infections and reduce the need for medical treatment.

The WHO believes that these benefits make climate and health investments an important opportunity for governments seeking to strengthen both public services and economic resilience.

Low- and Middle-Income Countries Could Gain Significantly

The report indicates that the benefits of implementing climate and health measures could be particularly significant in low- and middle-income countries.

These nations often face greater difficulties in dealing with extreme weather events because of limited infrastructure, financial resources and healthcare capacity.

Communities without reliable drinking water, sanitation and electricity may be more vulnerable to climate-related health emergencies.

Healthcare facilities in resource-constrained areas can also face difficulties maintaining essential services during floods, heatwaves and other extreme events.

The WHO has therefore highlighted the importance of directing investments towards regions where preventive interventions could deliver the greatest improvements.

Strengthening public health infrastructure in these countries could help reduce existing inequalities while improving preparedness for future climate risks.

The report also suggests that investing in basic services can generate benefits across multiple sectors, making such interventions valuable for both health and development planning.

Climate Action Can Reduce Carbon Emissions

Apart from preventing deaths and improving health outcomes, the six recommended interventions could contribute significantly to environmental protection.

The WHO estimates that their wider implementation could avoid 16.7 billion tonnes of carbon dioxide emissions.

This is equivalent to approximately 31 per cent of global annual greenhouse gas emissions, excluding emissions associated with land use, land-use change and forestry.

Reducing dependence on polluting household fuels and improving fossil fuel pricing policies are particularly relevant to this objective.

At the same time, climate-resilient infrastructure can help communities adapt to environmental changes that are already affecting their health and living conditions.

The WHO describes the combined benefits as a triple dividend involving healthier populations, lower emissions and stronger economies.

The organisation believes that governments should assess climate policies not only through their environmental impact but also through their potential contribution to public health.

Governments Urged to Prioritise Preventive Investments

The WHO has called on governments, development partners and financial institutions to use the findings as a basis for stronger investment in climate-related health programmes.

The organisation said many of the recommended interventions are already supported by available scientific evidence and can be implemented using existing technologies.

However, successful implementation will require coordination between different government departments.

Health ministries must work alongside agencies responsible for energy, transport, water, sanitation, housing and urban development.

For example, heat-health warning systems require cooperation between meteorological services, hospitals and local administrations.

Similarly, improving drinking water infrastructure involves public health authorities, engineering agencies and local governments.

Financial institutions and development partners can support countries by providing investment and technical assistance for projects that strengthen essential services.

The WHO has also emphasised that climate commitments should include specific measures to protect vulnerable populations.

Importance of COP31 for Global Health

The release of the report ahead of COP31 adds a public health dimension to the upcoming international climate discussions.

Governments participating in climate negotiations will be expected to consider ways of reducing emissions and improving preparedness for climate-related risks.

The WHO believes that health protection should be a central component of national climate strategies.

It has encouraged countries to incorporate health considerations into decisions involving energy production, urban development, water management and environmental protection.

The organisation has also stressed that preventive interventions can offer immediate benefits while supporting longer-term climate objectives.

Investments made today could help reduce exposure to environmental risks and strengthen the capacity of healthcare systems to respond to future emergencies.

The report provides an economic basis for policymakers to evaluate the potential returns of such investments.

Building Healthier and More Climate-Resilient Communities

The WHO’s latest assessment demonstrates that addressing climate change can also provide an opportunity to improve healthcare outcomes.

The estimated prevention of 1.6 million deaths annually highlights the potential impact of relatively practical interventions when implemented on a large scale.

Heat warnings, safe drinking water, sanitation, hygiene facilities, cleaner household energy and effective fuel pricing can collectively reduce several major health risks.

However, achieving these benefits will depend on sustained political commitment, appropriate financing and effective implementation.

The organisation has cautioned that the figures are based on modelled projections involving expanded coverage of the recommended interventions. Actual results will depend on how effectively countries put the measures into practice.

For governments, the message is that climate action should not be viewed only as an environmental responsibility.

It is also an investment in healthier populations, stronger healthcare systems and more resilient economies.

With climate-related risks continuing to affect communities worldwide, the WHO has urged countries to move beyond policy commitments and accelerate the implementation of measures that can protect lives.