The Clean Shipping Act of 2025 establishes new environmental standards for ocean-going vessels to reduce greenhouse gas emissions from shipping. The bill requires vessels of 400 gross tons or larger operating on voyages involving U.S. ports to progressively reduce the carbon intensity of their fuel, starting with a 30 percent reduction by 2030 and reaching zero-carbon fuel requirements by 2050. The Environmental Protection Agency must finalize the initial standards by January 2029 and subsequent standards at least two years before they take effect, with flexibility to adjust requirements if they are not technologically or economically feasible. Additionally, the bill requires vessels anchored or docked at U.S. ports to eliminate greenhouse gas and air pollutant emissions by 2035, and mandates annual public reporting of vessel emissions data to track compliance with the new standards.
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