Researchers led by Vrije Universiteit Brussel have confirmed a clear warming signal across the Congo Basin stretching back to the 1960s. The study, published in the journal Earth System Dynamics, drew on historical weather records from the Democratic Republic of the Congo — including paper archives held by the Institut National pour l'Etude et la Recherche Agronomiques in Yangambi and the State Archives of Belgium.
The headline number: hot days became nearly twice as common across the basin over two decades. That's not a model projection. It's what the thermometers already recorded.
Why the Congo Basin records matter
The Congo Basin isn't just a climate story — it's a supply chain story. The region supplies a huge share of the world's cobalt, a key input for lithium-ion batteries that power everything from electric vehicles to data center backup systems. Copper mining is concentrated there too.
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Heat stress on workers, water scarcity, and damaged infrastructure all raise the cost of getting minerals out of the ground. The research doesn't make that argument directly. But it gives the mining industry something it hasn't had: a long-run, locally grounded temperature record instead of reanalysis data stitched together from satellite estimates.
What's in the archives
The INERA archive in Yangambi holds decades of handwritten weather logs from what was once a major agricultural research station. The Belgian state archives fill in gaps from the colonial and post-independence periods. Combining them produces a continuous record that predates most modern weather services in the region.
That matters for anyone trying to price long-term risk in Central Africa. Insurers, lenders, and ESG analysts have leaned on sparse or interpolated data for this part of the world. Paper records don't lie about what the temperature was in 1965.
The mining angle
Nobody in this study is talking about crypto. But the overlap is hard to ignore for anyone watching mineral supply chains.
ASIC miners and GPUs depend on the same metals — cobalt, copper, rare earths — that come out of this region. If heat stress makes Congolese mining more expensive or less reliable over time, that cost eventually shows up in hardware prices and, by extension, in mining economics.
The study's finding that hot days doubled in two decades also implies a compounding effect on labor productivity. Mining companies have already been experimenting with automation in extreme environments. More automation could shift which metals are in demand and which aren't — a slow-moving force that reshapes commodity markets and, eventually, the cost structure of crypto mining.
The dataset is now public, which means climate modelers, insurers, and supply chain analysts can start using it. The obvious next step is for researchers to extend the record further back or into neighboring countries, where similar paper archives may still be sitting in filing cabinets.
The study doesn't offer forecasts about cobalt prices or mining output. It doesn't need to. It's a thermometer reading, not a prediction — and the thermometer says the basin has been heating up for more than half a century.
