By Abbas Nazil
A new study by researchers at Yale University has found that climate change is likely increasing the burden of childhood malaria in parts of Africa, particularly in cooler regions, although decades of malaria control and eradication efforts have significantly outweighed the disease’s climate-related impacts.
The findings, published in the journal *Nature*, suggest that rising temperatures and changing rainfall patterns are altering malaria transmission across the continent, with East and Southern Africa facing increased risks while some hotter regions in West Africa may experience slight declines in transmission.
Lead author Colin Carlson, Assistant Professor of Epidemiology at the Yale School of Public Health, said reducing greenhouse gas emissions alongside sustained malaria eradication efforts remains essential to protecting vulnerable populations, especially children.
According to Carlson, meeting global climate targets such as those outlined under the Paris Agreement could prevent several malaria cases among children living in cooler parts of Africa where the disease is expanding due to changing climatic conditions.
The research addresses a scientific debate that has continued for more than two decades over whether climate change is directly worsening malaria or whether other factors, including poverty, access to healthcare, and public health interventions, play a greater role in shaping disease patterns.
To provide clearer evidence, the researchers applied an emerging scientific approach known as impact attribution, which estimates the influence of human-driven climate change by comparing the current world with simulated scenarios in which climate change had not occurred.
Using an extensive dataset covering childhood malaria cases from the early twentieth century, the team first developed statistical models linking malaria prevalence with temperature, flooding, and drought.
They then estimated how climate change had influenced malaria throughout the twentieth century before projecting future impacts under different greenhouse gas emission scenarios during the twenty-first century.
The analysis found that climate change has probably caused a modest increase in malaria cases across Africa over the past decade, equivalent to approximately one additional case for every 1,000 children.
However, the researchers emphasized that widespread malaria prevention and treatment programmes have reduced the disease burden by an estimated 200 times more than the increase attributed to climate change.
The study also revealed significant regional differences in malaria risk across the continent.
Rising temperatures are making cooler regions in East and Southern Africa increasingly suitable for malaria transmission, allowing mosquitoes carrying the disease to spread into areas that were previously less affected.
In contrast, parts of West Africa that already experience consistently high temperatures may gradually become less favourable for malaria transmission because extreme heat can reduce mosquito survival and disease spread.
The researchers explained that mosquitoes are cold-blooded insects whose ability to transmit malaria is strongly influenced by environmental temperatures, with transmission reaching its highest efficiency at around 25 degrees Celsius.
Although climate change is expected to continue reshaping malaria distribution over the coming decades, the scientists stressed that strong public health interventions can continue to limit its overall impact.
They noted that continued investment in disease surveillance, mosquito control, improved healthcare, and climate mitigation policies will be critical to preventing malaria from expanding into vulnerable communities while supporting long-term eradication efforts across Africa.
The researchers concluded that climate change is redistributing malaria risk rather than causing a uniform increase across the continent, highlighting the need for region-specific adaptation strategies that combine climate action with sustained investments in public health to protect millions of African children from future disease threats.