Page 31 - 2019 Sustainability Report

To achieve these reduction targets, we expect to evaluate
a number of potential operational improvements and Tire shredding in action.
alternatives, including:

• Coal replacement and tire derived fuel (TDF)
investments.

• Continued use of synthetic gypsum as a substitute
for natural gypsum. Whereas natural gypsum is
mined, synthetic gypsum is a byproduct of flue gas
desulfurization (FGD) — a scrubbing technology
utilized by many coal-fired power plants to reduce
SO . Recaptured synthetic gypsum provides the same
2
chemical (calcium sulfate dihydrate) and physical
properties as natural gypsum, and its use diverts
this material from overburdened landfills.

• Leadership positions in trade associations that
support actions to control climate change, such
as the PCA and National Ready Mixed Concrete
Association (NRMCA).

• Support of the MIT Sustainability Hub, which
conducts research supporting the beneficial use of
low-carbon footprint concrete and brings together
leaders from academia, industry and government to
develop a holistic approach that will achieve durable
and sustainable homes, buildings and infrastructure
in ever more demanding environments.

• The addition of slag to our process, as was reflected
in our CemStar patented technology. In 2019, the
slag addition represented almost 4 percent of our
clinker production.

• Use of additional alternative fuels, including the
purchase of wind energy and other renewables.

In addition, we are active in the cement and lime industry
associations and are following with interest the innovative
technology testing that is ongoing throughout the world.
As new technologies are proven to be effective, we will
look to incorporate those into our operations as we
upgrade our facilities.
Midlothian, Texas, Tire Derived Fuel System
We also recognize the importance of continuing
to set goals for sustainability and to increase
transparency around GHG emissions reporting, and
thus, we expect to make additional reports and
commitments for our businesses in the years to
come. For example, we anticipate the next iteration of
our Sustainability Report will include, for the first time,
reports on our Scope 2 CO e emissions across all business
2
lines. In addition, if appropriate, we plan to consider
the consistency of any future emissions targets with
science-based methodologies and their alignment with
international objectives such as the Paris Agreement.

31 / MARTIN MARIETTA / SUSTAINABILITY REPORT / 2019