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  1. The Economist7 min

    How scientists calculate climate change

    Vilhelm Bjerknes, Oliver Morton

    Building on Wilhelm Bjerknes' 19th-century formulas, modern atmospheric computers now operate 25 trillion times faster than early models to simulate global climate behavior through complex grid systems. Although technical limitations regarding small-scale cloud dynamics create divergent warming projections, historical data confirms these tools accurately forecast observed trends when paired with economic scenarios that link human policy to temperature outcomes. Ultimately, while these models cannot predict human decisions, they remain the essential instrument for quantifying carbon dioxide's impact and guiding the stringent emission reductions necessary to meet Paris Agreement targets.