Study: Malaria Shifting From West Africa to Cooler Zones
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- Tamma Carleton at UC Berkeley led the modelling study, analyzing data from more than 50,000 malaria prevalence surveys across sub-Saharan Africa between 1900 and 2016 and condensing them into 9,875 monthly averages at the state or province level.
- Under a high-emissions scenario producing roughly 2.4°C of global warming, the model projects about 45 fewer malaria cases per 1,000 children in West Africa and 16 fewer per 1,000 in Central African nations like the Democratic Republic of the Congo by 2100 versus the 2015–2020 baseline.
- From 2010 to 2014, human-caused warming already added roughly 1 extra malaria case per 1,000 children across sub-Saharan Africa, with the additional infections most concentrated in West and Central Africa.
- The same model projects malaria prevalence rising in cooler and high-elevation regions including parts of Kenya, Burundi, Angola, Zambia, and northeastern South Africa — areas Carleton notes have had less investment in prevention and lower acquired immunity.
- Ilan Noy at Victoria University of Wellington called the paper 'meticulous' but stressed that climate is only a 'second-order effect' — functioning health systems and public health investment remain the dominant factor in actual elimination.
- Sadie Ryan at the University of Florida called the work 'really elegant' for pulling together multiple data types, but said 'it's sad to see such stark evidence of climate-driven shifts' given existing capacity to mitigate warming.
Why it matters: The study reframes malaria from a static tropical-disease problem into a climate-migration story: West and Central Africa could see steep declines by 2100, but Kenya, Burundi, Angola, Zambia, and northeastern South Africa will absorb a growing caseload in regions with weaker prevention infrastructure and lower immunity. Noy's caveat that climate is a 'second-order effect' underscores that public health investment — not temperature alone — will determine whether elimination actually materializes.
