MARTIN MARIETTA MATERIALS INC
MLM
Materials
2
exclusion reasons
1 theme
This page is part of our public exclusion list — a transparency tool that shows which companies we screen out and why. It is not investment advice, and it is not an accusation. But it is subject to change as our understanding of the facts evolves.
Martin Marietta Materials exhibited very limited engagement with climate change policy in 2023-25, taking positions that are broadly unsupportive of climate regulation according to independent assessments. The company’s primary climate commitment is a 2030 science-based target for Scope 1 and 2 emissions, but this excludes its most material emission source: Scope 3 emissions from the downstream use of its cement and aggregates. Cement production, a core business line, is a chemically intensive process that generates significant greenhouse gases. By omitting these value chain emissions, which constitute the largest portion of its carbon footprint, the company’s public climate pledge presents a misleading picture of its full climate impact. This pattern aligns with broader industry findings where major corporations use incomplete or ambiguous climate claims.
Martin Marietta's Magnesia Specialties subsidiary operated lime kilns at its Woodville, Ohio dolomitic lime plant under obsolete permits for over 30 years. The EPA issued Notices of Violation in 2010 and 2011 after including the lime industry as a national enforcement priority under the federal Clean Air Act. The EPA found that Martin Marietta had modified and operated its kilns without proper permits and without installing the best available pollution controls.
The resulting settlement required an estimated $20 million in pollution control upgrades at the Woodville facility. The plant produces dolomitic lime primarily for the steelmaking industry. Separately, ViolationTracker documents a broader pattern of environmental enforcement actions against Martin Marietta, with cumulative penalties across its aggregate quarry and materials operations. The 30-year permit gap — operating major industrial equipment without required pollution controls for three decades — reflects a systemic compliance failure, not an isolated incident.
Research Sources
3 organizations
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