Climate Crisis Threatens Global Healthcare as ADB Warns of Trillions in Economic Losses by 2050

An Asian Development Bank study warns that inadequate climate financing threatens global health systems, potentially causing millions of premature deaths and trillions in economic losses by 2050. It urges governments to strengthen health budgets, expand international funding, attract private investment and introduce innovative financing to build climate-resilient health systems.

Climate change is becoming one of the biggest threats to global health systems, exposing millions of people to extreme heat, infectious diseases, natural disasters and rising medical costs. A new study published in October 2026 by the Asian Development Bank (ADB), with contributions from Health Care Without Harm, warns that inadequate financing is preventing developing countries from preparing hospitals, health workers and medical infrastructure for worsening climate risks. The report, titled Closing the Financing Gap for Climate-Resilient Health Systems, was prepared by researchers Naomi Beyeler, Josh Karliner, Diana Picon Manyari, Eduardo Banzon, Brian Riley and Ben Coghlan. It calls for stronger government investment, international assistance, private financing and innovative financial solutions to protect vulnerable communities, particularly across Asia and the Pacific.

The report highlights the enormous human and economic consequences of failing to address climate change. Drawing on World Bank estimates, it warns that climate-related impacts could contribute to between 14.5 million and 15.6 million premature deaths globally by 2050 under different climate scenarios. Climate-related health impacts could cost the global economy between $8.6 trillion and $15.4 trillion by mid-century, including approximately $1.1 trillion in additional health system expenses. Across Asia and the Pacific, broader climate-related economic losses could reach approximately 17% of regional gross domestic product by 2070.

Climate Crisis Exposes a Dangerous Health Funding Gap

Despite increasing global attention, health systems receive only a small share of international climate financing. Less than 5% of international climate adaptation finance includes health as a component or additional benefit, while less than 1% primarily targets the health sector.

International commitments for climate and health action reached approximately $7.1 billion in 2022, but fewer than half reached least-developed countries. Complicated application procedures, fragmented funding arrangements and limited government capacity make accessing financial assistance particularly difficult for vulnerable nations.

The study emphasizes that prevention is considerably more economical than responding to disasters. Every dollar invested in climate adaptation can generate up to $10 in benefits through reduced illness, avoided deaths and improved economic productivity. Strengthening hospitals, disease prevention programmes, medical supply chains and health infrastructure could prevent up to $290 billion in annual economic losses by 2050.

Governments Must Put Climate Protection Into Health Budgets

The researchers recommend five interconnected strategies to address the financing shortage, beginning with stronger government institutions and better coordination between ministries responsible for health, finance, environment and economic development.

Countries need detailed investment plans identifying climate-related health risks, estimating financial requirements and converting policy commitments into practical projects. Stronger institutional capacity would also help governments secure international funding and monitor results.

Domestic public financing forms another important priority. Governments should incorporate climate resilience into hospital construction, medical procurement, health insurance, public budgets and social protection programmes.

The Philippines' climate expenditure tracking system demonstrates how governments can identify climate-related spending, although inconsistent implementation remains a challenge.

The report also recommends carefully designed fossil fuel subsidy reforms to generate resources for health and climate priorities. Experiences from India and Indonesia show how such reforms can support social programmes and cleaner energy investments. However, governments must protect low-income households against higher energy costs.

International Support and Private Investment Can Strengthen Hospitals

International financing remains essential for countries facing severe climate risks and limited government resources. The researchers urge development institutions to prioritize grants and affordable loans rather than financing arrangements that increase debt burdens.

Debt-for-health swaps provide another opportunity. The Global Fund's Debt2Health programme has supported approximately $470 million in debt cancellation and $330 million in health investments through 14 agreements since 2007.

Community-focused initiatives in the Lao People's Democratic Republic also demonstrate how international assistance can strengthen primary health services and support vulnerable populations.

Private investment offers additional opportunities, although it currently represents only around 3% of adaptation financing in low- and middle-income countries.

Governments and development banks could attract investment through guarantees, tax incentives and public-private partnerships. Such financing could support climate-resilient hospitals, renewable energy systems, sustainable medical supply chains and digital health services.

However, the report warns that private investment must not undermine affordable treatment or equal access to essential medical services. Strong regulations and public accountability remain necessary.

Climate Insurance and Regional Cooperation Offer New Hope

The final strategy focuses on innovative financing, including climate insurance, philanthropic investment, improved information systems and regional cooperation.

India provides practical examples of insurance programmes protecting informal workers against extreme heat and dangerous air pollution. Some schemes provide automatic payments when temperatures or pollution levels exceed predetermined thresholds, helping workers protect their health without completely losing their income.

Regional organizations, including ASEAN, could also strengthen cooperation on disease surveillance, early warning systems, disaster preparedness and medical procurement.

The study stresses that financing solutions must reflect individual countries' economic circumstances. Low-income countries require greater grant assistance and debt relief, while middle-income economies can increasingly combine domestic budgets with private investment and international support.

Ultimately, the report warns that without urgent financial reforms, climate-related disasters could overwhelm hospitals, deepen poverty and reverse development gains. Building climate-resilient health systems is therefore not simply an environmental responsibility but an essential investment in public health, economic stability and long-term development.