AUTHOR=Zhang Guangsheng , Zhang Zhaomin , Yuan Hao , Chen Weijie TITLE=Emission-reduction investment strategies in competitive shipping supply chains under carbon cap-and-trade mechanisms JOURNAL=Frontiers in Marine Science VOLUME=Volume 12 - 2025 YEAR=2025 URL=https://www.frontiersin.org/journals/marine-science/articles/10.3389/fmars.2025.1546146 DOI=10.3389/fmars.2025.1546146 ISSN=2296-7745