Amidst growing concerns about the impact of climate change, new research underscores a severe health crisis looming over Africa. Malaria, a disease already devastating the continent, is poised to worsen, potentially leading to an additional half a million deaths within the next 25 years.
A study published in Nature highlights the potential for climate change to drastically increase malaria cases in Africa. The research projects an alarming 123 million more malaria cases due to extreme weather and temperature shifts, even if existing climate commitments are upheld.
The research team points out that as global temperatures rise, extreme weather events such as floods will become more frequent, disrupting malaria treatment efforts and damaging infrastructures like housing. These disruptions are expected to contribute to 79% of the increased transmission risk and 93% of the additional deaths anticipated.
The remaining surge in malaria cases is attributed to climate-induced changes in temperature and rainfall, which expand the habitats suitable for the disease-carrying mosquitoes. The study notes that most new cases will emerge in regions already familiar with malaria, rather than spreading to new territories.
Researchers stress the need for robust malaria prevention and treatment systems that are resilient to climate-related disruptions. They argue that current analyses often fail to account for how climate-fragile these health systems are in Africa.
Malaria in a Changing Climate
The World Health Organization (WHO) reported that 610,000 people died from malaria in 2024. Africa bore the brunt with 95% of cases and deaths occurring on the continent, with children under five being most affected.
Mosquitoes, the disease vectors, thrive in warm climates and need stagnant water to breed. Rising temperatures and shifting rainfall influence the geographical spread of these insects, making climate a crucial factor in malaria transmission.
Various studies, including those by Prof Peter Gething and Prof Tasmin Symons of Curtin University, emphasize that while climate change expands mosquito habitats, it also exacerbates vulnerabilities through increased weather extremes.
Impact of Extreme Weather
The study projects that 79% of the anticipated increase in malaria transmission will stem from more frequent and severe weather events. Floods and cyclones not only create breeding grounds for mosquitoes but also disrupt essential healthcare services by damaging infrastructure and preventing access to treatment.
Projections indicate that by mid-century, cyclones in the Indian Ocean will intensify, and flooding will become more prevalent across Africa. These conditions will elevate malaria risk, particularly in major river systems and cyclone-prone coastal areas of southeast Africa.
Without significant mitigation efforts, the study estimates that 67% of Africans will face higher malaria risks due to climate change between 2024 and 2050.
Understanding Mosquito Habitats
To investigate the ecological effects of climate change, researchers analyzed temperature, rainfall, and humidity data alongside mosquito lifecycle and habitat information. This data was then compared to malaria infection prevalence among children, using sophisticated models to estimate case increases.
Overall, climate change will cause only a slight increase in malaria cases by 2050. However, this masks significant geographical differences, with some areas seeing substantial increases and others decreases in malaria rates.
Future Projections and Mitigation
By 2050, climate change is expected to result in 532,000 additional malaria deaths, assuming current mortality rates persist. Researchers emphasize the need for climate-resilient health strategies, including robust infrastructure and early warning systems for extreme weather events.
Senior researcher Dr Adugna Woyessa from the Ethiopian Public Health Institute highlights that the study’s findings could guide national malaria programs and local studies in Africa.
Symons and Gething emphasize integrating malaria control into disaster risk planning and ensuring community health workers are well-prepared for severe weather events. They stress the need for resilient healthcare systems to withstand the challenges posed by climate change.
Original Story at www.carbonbrief.org