2026-01-15 カリフォルニア大学サンディエゴ校（UCSD）
＜関連情報＞
- https://today.ucsd.edu/story/study-finds-ocean-impacts-nearly-double-economic-cost-of-climate-change
- https://www.nature.com/articles/s41558-025-02533-5
海洋への影響を考慮すると、炭素の社会的コストはほぼ2倍になる Accounting for ocean impacts nearly doubles the social cost of carbon
Bernardo A. Bastien-Olvera,Octavio Aburto-Oropeza,Luke M. Brander,William W. L. Cheung,Johannes Emmerling,Christopher M. Free,Francesco Granella,Massimo Tavoni,Jasper Verschuur & Katharine Ricke
Nature Climate Change Published:15 January 2026
DOI:https://doi.org/10.1038/s41558-025-02533-5
Abstract
Oceans provide essential benefits to people and the economy, underpinned by the extent and condition of marine ecosystems and infrastructure—or ‘blue’ capital. However, the impacts of climate change on blue capital have been largely overlooked in influential indicators such as the social cost of carbon (SCC). Here we integrate the latest ocean science and economics into a climate-economy model, capturing climate change impacts on corals, mangroves, seaports, fisheries and mariculture to estimate their welfare repercussions at a global scale. Conceptually, this ocean-based SCC (blue SCC) represents a component of the total SCC currently omitted in standard estimates. We estimate the 2020 blue SCC to be US$48 per tCO2 (US$38–70, 25th–75th percentile) with baseline discounting, representing an almost doubling of the SCC estimate from the same model without considering ocean-related impacts. The blue SCC increases to US$168 for a discount rate of 2%.
