Page 59 - Martin Marietta - 2024 Sustainability Report

ENVIRONMENTAL STEWARDSHIP

Efforts to reduce transportation-related emissions will increasingly be incentivized or required by regulation. Heavy
on-road trucks are already highly regulated and we expect emissions standards will continue to become stricter. We
expect that railroad engines will face similar standards. We will continue to support our vendors in their efforts to reduce
their Scope 1 emissions, thereby reducing our Scope 3 emissions.

Our Aggregates and Downstream Businesses

In our aggregates product line, which is the largest of our businesses, the primary source of our Scope 1 CO e emissions is the
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consumption of diesel fuel in our mining operations. The same is largely true of our targeted downstream operations, namely
ready mixed concrete and asphalt and paving services, that have similar mobile combustion sources, including off-road and on-
road equipment. These downstream businesses also use natural gas in their processes, and those emissions, while considerably
smaller than their diesel-related emissions, are included in the total carbon footprint provided in this report.

In an effort to mitigate the risks to the Company associated with GHG emissions while ensuring and improving financial
sustainability, we have made significant capital investments in our mobile fleet in both the aggregates and targeted
downstream businesses. We have also invested significant capital to right-size our operations, which can result in an
operation using fewer pieces of equipment and, for the aggregates business, shorter haul distances from the mine to
the crushing plant. Finally, as noted in this report we continue to invest capital in fixed plant equipment modernizations
that result in, among other things, Scope 2 efficiencies. See “Our Roadmap” starting on page 67 of this report.

Notably, like our Magnesia Specialties business, our
aggregates business also produces material that is “In an effort to mitigate the risks to the
used by others to reduce emissions. For example, in 2024 Company associated with GHG
our limestone aggregate operations produced more than
emissions while ensuring and improving
111,000 tons of scrubber stone sold to power producers
financial sustainability, we have made
and chemical manufacturers for use in reducing their sulfur
dioxide (SO ) emissions. As noted earlier, our significant capital investments in our
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aggregates production — although it represents the mobile fleet at both the aggregates and
majority of our facilities and consolidated revenue — targeted downstream businesses.”
has a small direct GHG emissions footprint.

In addition to products like our scrubber stone, in 2024 we EPA estimates that 600 million tons of construction and
continued to operate in the recycled aggregate market demolition debris was generated in the United States in
with sites in Texas, Minnesota and California. In 2024, 2018. That volume is more than two times the amount of
across our network of operations, our operations municipal solid waste generated in the country each year.
processed 2.7 million tons of concrete generated from Landfills are finding it hard to meet the growing demand
various construction/demolition projects (e.g. bridge/ for space so every pound of material that can be recycled is
building demolition, highway projects, airport a net gain.
reconstruction, and port projects). During this same period,
our operations sold over 2.3 million tons of this material. Jason Lynch, Regional VP/GM — Southern Texas Aggregates
This material is recycled and converted to various recycled Region, oversees a network of recycling yards around
products such as crushed base, ballast and rip rap. Houston, Texas. In 2024, these 10 operations recycled
concrete from a 2,900 square mile area around
As discussed further below in the “Recarbonation” section, metropolitan Houston. Lynch sees benefits on many levels.
recycled concrete can play a part in reducing the GHG “The production of locally sourced materials supplements
footprint of cement through the process of recarbonation. the supply of aggregates in this market with few local
Moreover, by recycling concrete versus mining virgin natural sources. The business is a little different than a
aggregate, a certain portion of the GHG emissions that quarry because we are working with other companies and
would otherwise be released are eliminated. Finally, the the public to acquire the raw materials that will ultimately be

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