The Impact of Climate Change on Global Health: A Growing Concern

As the world observes World Environment Day, experts warn that climate change is rapidly emerging as a major public health threat. Rising temperatures and extreme weather events are not only impacting the environment but also contributing to a growing burden of diseases. Vulnerable populations, including children and pregnant women, face heightened risks. This article delves into the connections between climate change and health, highlighting the urgent need for awareness and preparedness to combat these challenges.

By Narendra Chaudhary Jun 5, 2026, 13:19 IST

World Environment Day: A Call to Action

Every year, June 5 marks the observance of World Environment Day. The theme for 2026, "Inspired by Nature. For Climate. For Our Future," emphasizes the critical need to tackle environmental issues that jeopardize both our planet and human health. As part of the 2015 Paris Agreement, countries committed to limiting global warming to 1.5°C above pre-industrial levels to prevent severe climate impacts. However, a recent report from the World Meteorological Organization (WMO) indicates a 91% likelihood that global temperatures will surpass this threshold for at least one year between 2026 and 2030. While temporary exceedances of the 1.5°C limit do not signify a permanent failure of the Paris Agreement, the consequences of a warming planet are increasingly visible. Signs such as rising sea levels, destructive wildfires, prolonged heatwaves, and melting glaciers are evident worldwide. On World Environment Day 2026, health experts highlighted that climate change is rapidly becoming a significant public health threat, contributing to a rising global disease burden and facilitating the spread of infectious diseases.

Climate Change: A Public Health Crisis

Climate Change: A Public Health Emergency

Climate change has evolved from being merely an environmental concern to a pressing public health crisis. Dr. Sabine Kapasi, a UN advisor, notes that rising temperatures, deteriorating air quality, and changing weather patterns are already impacting the health of millions globally. "Longer and more intense heatwaves are leading to an increase in heat-related illnesses. Air pollution exacerbates respiratory diseases, while shifting weather conditions threaten food security and nutrition in various regions," she stated. In India, vulnerable populations such as children, pregnant women, and those in flood- and drought-prone areas are particularly at risk. Women face additional challenges related to water access and sanitation. Despite a nearly 80% reduction in malaria cases since 2015, climate change introduces new health threats that could strain healthcare systems further.

The Link Between Climate Change and Infectious Diseases

Climate Change Fueling Infectious Diseases

Experts warn that shifting climatic conditions are fostering an environment conducive to the spread of infectious diseases. Dr. Kapasi explained that warmer temperatures and altered rainfall patterns facilitate mosquito breeding and prolong their activity, heightening the risk of disease transmission. Extreme weather events like floods exacerbate the situation by contaminating drinking water, damaging sanitation infrastructure, and disrupting healthcare services. Climate-induced displacement can lead to overcrowded shelters, increasing the risk of infections such as cholera, leptospirosis, and tuberculosis. "Recent climate-related disasters in South Asia and Africa illustrate how swiftly an environmental crisis can escalate into a public health emergency," she remarked. Mosquito-borne diseases like dengue, malaria, and chikungunya are becoming increasingly prevalent, even in regions where they were once uncommon. Countries in Europe, including Italy, France, and Spain, have reported a rise in locally transmitted dengue and chikungunya cases over the past decade. In the United States, locally acquired malaria cases have been detected in Florida and Texas for the first time in nearly twenty years. India is also experiencing a surge in dengue cases, with outbreaks becoming more frequent during the monsoon and post-monsoon seasons. Experts predict that dengue cases could reach approximately 278,000 in 2025, up from around 230,000 the previous year, as rising temperatures and changing rainfall patterns help disease-carrying mosquitoes thrive.

Chronic Diseases and Climate Change

Climate Change Increasing Chronic Diseases

Dr. Devarsetty Praveen, Program Director at the NIHR Global Health Research Centre for Non-communicable Diseases and Environmental Change, emphasized that climate change impacts both infectious and chronic diseases. "Climate change heightens health risks through rising temperatures, extreme weather events, deteriorating air quality, and shifting disease patterns. In India, both communicable and non-communicable diseases are affected, with vulnerable populations bearing the brunt of these changes," he stated. Research indicates that individuals with chronic conditions like hypertension and diabetes are particularly vulnerable to extreme heat, underscoring the connection between climate change and non-communicable diseases. Dr. Praveen noted that variations in temperature, humidity, and rainfall can influence disease transmission while also affecting water quality, food systems, and interactions between humans, animals, and disease vectors. "These changes can lead to more frequent, widespread, and unpredictable disease outbreaks," he added.

Protecting Health in a Changing Climate

How to Safeguard Against Climate-Related Health Risks

Experts advocate for awareness and preparedness as climate change continues to alter global disease patterns. Individuals are encouraged to stay updated on weather forecasts, maintain hydration, limit outdoor activities during extreme heat, and take measures to protect against mosquito bites. Those with chronic conditions such as hypertension, diabetes, heart disease, and kidney disease should ensure they have sufficient medication and seek medical advice during prolonged heatwaves. To mitigate the risk of mosquito-borne diseases, households should eliminate stagnant water from containers like buckets, coolers, and flower pots, where mosquitoes breed. The use of repellents, mosquito nets, and protective clothing can offer additional protection. Dr. Kapasi also highlighted the importance of food and water safety, especially after heavy rainfall or flooding. Ensuring access to safe drinking water, proper food storage, and good hygiene practices can significantly lower the risk of infections. Individuals with pre-existing health conditions should keep essential medications readily available during extreme weather events.