Climate change: 580 million children exposed to 20 extra heat‑stress days a year

According to current data analyses, around 580 million children worldwide are exposed each year to at least 20 additional heat‑stress days. More than 40 percent of children under ten already face this extra burden today.

A heat‑stress day occurs when high temperatures combined with humidity severely limit the body’s ability to cool itself, increasing the risk of heat‑related illnesses. Unlike record high temperatures alone, the metric focuses on whether the body can no longer dissipate heat effectively.

Why children are particularly vulnerable

Children are more susceptible because their fluid balance, thermoregulation and metabolism differ from adults. Preexisting conditions, malnutrition and lack of access to safe drinking water further exacerbate the risks.

Regional hotspots of exposure

The additional heat days are distributed unevenly across the globe. Densely populated areas in South and Southeast Asia, large parts of sub‑Saharan Africa, parts of Latin America, as well as the Middle East and North Africa are particularly affected. There, high population numbers meet inadequate infrastructure: many schools and health facilities lack cooling, adolescents often work outdoors, and urban heat islands push local extremes even higher.

Inequality as a risk driver

Children in poorer countries bear the brunt, even though these states have historically contributed little to greenhouse gas emissions. Limited adaptation capacity — such as insufficient medical care, missing early‑warning systems and low investment in urban greenery — means the same increase in heat days has far more severe consequences in those places.

Health, education, nutrition: concrete consequences

Acute health dangers range from dehydration and heatstroke to worsening of chronic conditions. Common symptoms include dizziness, headaches and difficulty concentrating. Repeated heat exposure during sensitive developmental phases reduces learning ability, lowers physical activity and raises infection risk in already weakened immune systems. In many countries, heat shortens the school day or shifts tasks into the home environment. That promotes learning losses and widens existing inequalities in opportunity. At the same time, heat worsens food insecurity through crop failures and reduced food quality.

Prevention and adaptation

Responses must combine mitigation with local adaptation. Short‑term effective measures include drinking water stations and shaded areas at schools, strengthening health services with specific heat preparedness, and warning systems that communicate temperature‑related risks to parents and teachers. Cities can reduce heat burdens through more green spaces, cooling building materials and climate‑appropriate school construction standards. In rural areas, protecting drinking water systems and investing in climate‑resilient agriculture lowers risks for children. Long term, reliable financing, technical exchange and the involvement of affected communities are needed.

Financing and responsibility

The unequal distribution of impacts raises a question of justice. Climate finance, technology transfer and targeted child‑health programmes belong to the international community’s toolkit. At the same time, national budgets can deliver immediate protection by prioritizing education, health and infrastructure.

Children at the center of climate policy

The evidence shows: children are on the front lines of climate‑related health risks. Making infrastructure, social protection and education systems climate‑proof strengthens the resilience of entire societies. Climate policy therefore not only means reducing emissions, but also directly protects lives and secures development opportunities.