Climate Change: The Urgent Health Crisis - WHO & Brazil's Call to Action (2025)

Here’s a stark reality: Climate change is no longer a distant threat—it’s a health emergency happening right now. A groundbreaking report released today by the World Health Organization (WHO), the Government of Brazil (COP30 Presidency), and the Brazilian Ministry of Health reveals alarming statistics: over 540,000 people die annually from extreme heat, and one in every 12 hospitals globally is at risk of shutting down due to climate-related disasters. But here’s where it gets even more urgent: this isn’t just about numbers—it’s about lives, systems, and our collective future.

The COP30 Special Report on Health and Climate Change (available at https://www.who.int/publications/m/item/cop30-special-report-on-climate-and-health) shines a spotlight on the devastating interplay between rising temperatures and crumbling health systems. It’s a call to arms, urging immediate, coordinated action to safeguard health in a rapidly warming world. This report follows the launch of the Belém Health Action Plan, Brazil’s flagship initiative unveiled during COP30’s dedicated Health Day on November 13, 2025. But why does this matter? Because, as WHO Director-General Dr. Tedros Adhanom Ghebreyesus puts it, ‘The climate crisis is a health crisis—not in some distant future, but here and now.’

And this is the part most people miss: With global temperatures already surpassing 1.5°C above pre-industrial levels, the health impacts are escalating. Over 3.3 to 3.6 billion people live in areas highly vulnerable to climate change, and hospitals face a staggering 41% higher risk of damage from extreme weather compared to 1990. This isn’t just a warning—it’s a wake-up call. Without swift decarbonization, the number of at-risk health facilities could double by mid-century. The health sector itself, contributing 5% of global greenhouse gas emissions, must urgently transition to low-carbon, climate-resilient systems.

But here’s the controversial part: Are we doing enough to address health inequities in our adaptation efforts? The report highlights glaring gaps. Only 54% of national health adaptation plans assess risks to health facilities, and fewer than 30% consider income disparities, 20% gender, and less than 1% include people with disabilities. This raises a critical question: Can we truly protect health without addressing these systemic inequalities?

Professor Nick Watts, Chair of the Expert Advisory Group, emphasizes, ‘Protecting health systems is one of the smartest investments a country can make. Allocating just 7% of adaptation finance to health could safeguard billions and keep essential services running during climate shocks.’ Progress is happening—the number of countries with Multi-Hazard Early Warning Systems doubled to 101 between 2015 and 2023. Yet, only 46% of Least Developed Countries and 39% of Small Island Developing States have effective systems in place. Is this enough?

The report’s core message is clear: We have the evidence, the tools, and the interventions—from early warning systems to green hospital design—to act now. But adaptation strategies risk failure if they don’t tackle the root causes of health inequity. Governments are urged to:

• Integrate health objectives into climate commitments like Nationally Determined Contributions (NDCs) and National Adaptation Plans (NAPs).
• Use financial savings from decarbonization to fund health adaptation and workforce capacity.
• Invest in resilient infrastructure, prioritizing health facilities and essential services.
• Empower communities to shape responses that reflect their lived realities.

Brazil’s companion report, Social Participation, Climate, and Health (available at https://www.who.int/publications/m/item/cop30-special-report-on-social-participation), underscores the importance of inclusive participation. As Dr. Alexandre Padilha, Brazil’s Minister of Health, states, ‘Climate change is already directly affecting health systems worldwide. Recent tragedies prove that now is the time to act.’ But is the world moving fast enough?

The Belém Health Action Plan offers a roadmap, centered on health equity, climate justice, and community-led governance. Its three lines of action—surveillance, evidence-based policies, and innovation—aim to build climate-resilient health systems. But success hinges on one thing: Will we prioritize people over politics?

This isn’t just a report—it’s a challenge. Are we ready to turn evidence into action? Let’s discuss—what do you think is the most critical step to address the health impacts of climate change? Share your thoughts below!