気候変動が1地域で1700人の熱中症死の要因に(Climate change responsible for 1,700 heat-related deaths in single European region, Oxford study finds)

2025-09-10 オックスフォード大学

オックスフォード大学スミス環境・企業スクールの研究によると、スイス・チューリッヒ州で1969年から2018年までの50年間に発生した熱関連死亡のうち、約 1,700人(全体の約3分の1)が気候変動に起因するものであったと判明しました。研究は温暖化が極端な熱波だけでなく、健康に影響を及ぼす「比較的穏やかな日」にも死亡リスクを高めている点を明らかにしています。また、冷房の普及や医療体制の改善、熱への意識向上などにより、2004年以降約700人の命が救われた可能性も示されました。しかし、それでもなお死亡数は増加傾向にあり、著者のDr Rupert Stuart-Smithは、最も効果的な対策は「化石燃料・畜産依存からの脱却による速やかかつ持続的な排出削減」であると強調しています。

<関連情報>

気候変動の健康影響帰属手法の精緻化:チューリッヒにおける熱波死亡率の事例研究 Refining methods for attributing health impacts to climate change: a heat-mortality case study in Zürich

Rupert F. Stuart-Smith,Ana M. Vicedo-Cabrera,Sihan Li,Friederike E.L. Otto,Kristine Belesova,Andy Haines,Luke J. Harrington,Jeremy J. Hess,Rashmi Venkatraman,Thom Wetzer,Alistair Woodward & Kristie L. Ebi
Climatic Change  Published:10 September 2025
DOI:https://doi.org/10.1007/s10584-025-04011-5

気候変動が1地域で1700人の熱中症死の要因に(Climate change responsible for 1,700 heat-related deaths in single European region, Oxford study finds)

Abstract

Heat-related deaths occur throughout the summer months, peak during heatwaves, and are affected by temperature and exposed populations’ sensitivities to meteorological conditions. Previous studies found that climate change is increasing heat-related mortality worldwide. We build on existing epidemiological methods to shed light on the adverse effects of climate change on human health. We address limitations in existing methods and apply refined approaches to assess heat mortality attributable to human-induced climate change in Zürich, Switzerland, over 50 years (1969–2018) including a case study of summer 2018. Our methodological refinements affect how counterfactual climate scenarios are derived, and facilitate accounting for changing vulnerability, and assessing impacts during and outside heatwaves. We find nearly 1,700 heat-related deaths attributable to human-induced climate change between 1969 and 2018. Declining vulnerability to heat avoided at least 700 heat-related deaths. The approach described here could be applied elsewhere to quantify the effect of climate change on other health outcomes.

1904環境影響評価
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