The Clean Shipping Act of 2025 establishes new environmental standards for commercial shipping vessels to reduce greenhouse gas emissions from fuel used in U.S. waters and voyages involving U.S. ports. The bill requires ships of 400 gross tonnage or larger to progressively lower the carbon intensity of their fuel, starting with a 30 percent reduction by 2030 and reaching 100 percent reduction by 2050, with interim targets increasing in severity over time. Ship owners and operators must monitor and report fuel emissions annually to the Environmental Protection Agency, with public reporting requirements to track progress. The legislation also requires the EPA to establish standards by 2029 eliminating greenhouse gas emissions from vessels docked at U.S. ports by 2035, with flexibility provisions allowing the EPA to adjust timelines if new technologies are not yet feasible while still requiring maximum achievable reductions. The bill affects commercial shipping companies operating in U.S. waters and international shipping companies using U.S. ports, and it coordinates with international maritime standards set by the International Maritime Organization.
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