In the final installment of a three-part series on IMEG’s 2026 Whole Carbon Action Plan (WCAP), senior sustainability and energy engineer Laura Hagan discusses how the company is tackling embodied carbon in structural systems.

IMEG’s carbon reduction journey began four years ago when the firm became a signatory to SE 2050, the structural engineering industry’s initiative to eliminate embodied carbon in structures by the year 2050. That original structural-focused plan has evolved into IMEG’s broader WCAP, which now also incorporates MEP and infrastructure disciplines.

Laura, who also is a structural engineer, says SE 2050 “is a great program to be a part of because it really challenges us to be accountable for how we are designing and how we are trying to reduce embodied carbon.” Critical to this effort is first being able to measure the carbon impacts across IMEG’s large national project portfolio.

“We are in the process of trying to figure out what our designs mean in terms of carbon emissions,” Laura says. “Unfortunately, with the size of IMEG, it's not possible for us to do a whole building lifecycle assessment on every project the firm designs. So instead, we are using material schedules we created in Revit to calculate the quantities of materials in a structural model. Then we are going to transfer the quantities to an internal IMEG database that will multiply them by global warming potential (GWP) factors. This will give us a preliminary high-level assessment of the amount of embodied carbon a structural project is going to emit.” IMEG also will analyze the data for benchmarking purposes, she adds.

“When we are able to make this connection with the internal database, the designers and structural engineers will be able to see, in real time, the projected embodied carbon emissions of the quantities of materials that they are designing with,” Laura says. Engineers can then test different framing layouts, slab thicknesses, or material quantities and immediately see the impact on emissions. “Anyone who’s familiar with embodied carbon knows that if you can reduce the quantity of the material that you have, you’re going to reduce the amount of embodied carbon that you have.”

Laura says even small specification changes can produce meaningful results at scale. She references a case study involving slab-on-grade concrete design in which reducing slab thickness or lowering concrete strength produced a 10 percent to possibly 20 percent reduction in embodied carbon for that building element.

“It’s a great example of low-hanging fruit,” she says. “If you can reduce your quantity and it still performs perfectly for its structural capacities and serviceability requirements, you are going to save carbon and hopefully you’ll save some money too.”

Looking ahead, Hagan says innovation in low-carbon materials is crucial for achieving the long-term SE 2050 goal of net zero structural systems. “Innovation has to happen on the material side, then people have to start designing with it, and it has to make it into building codes as an allowable system. That all takes time, and then you have to build the demand for using the material on projects.”

Laura’s motivation comes from the engineering mindset itself. “We are problem solvers,” she says. “This is basically a giant problem that we don’t have all the solutions to, but it’s something that if we work together and continue to provide pressure to the industry we can reduce embodied carbon.

“People are recognizing that this is important and trying to address it. That’s what keeps me excited and what makes me happy to be doing this work and continuing to push for more every day.”

To learn more, listen to part one and part two of this series or read IMEG’s 2026 Whole Carbon Action Plan.

IMEG’s mechanical engineering decarbonization efforts take center stage in this episode, the second in a three-part series on the firm’s 2026 Whole Carbon Action Plan (WCAP).

Guest Lindsey Chappelle, an IMEG senior sustainability & energy engineer, explains that the mechanical component of the plan aligns with MEP 2040, the industry-wide mechanical decarbonization initiative. “This is the MEP firms’ commitment to be net zero operational carbon on projects by 2030 and net zero embodied carbon by 2040,” she says. “IMEG is a signatory of MEP 2040 and we have produced our mechanical plan, which has been incorporated into the Whole Carbon Action Plan.”

As with the WCAP’s structural and infrastructure initiatives, the plan lays out the goals, tasks, tools, and strategies for reducing and eventually eliminating operational carbon emissions (due to mechanical systems), embodied carbon of the mechanical equipment, and the carbon due to refrigerant leakage associated with certain HVAC systems. “Refrigerants are kind of weird. They don’t really fall into embodied carbon or operational carbon,” Lindsey says. “They’re kind of their own item.” Refrigerants, however, can have a sizeable impact. In one pilot project, leakage accounted for roughly 15% of total MEP-related carbon emissions.

While the industry has a firm grasp on how to reduce operational carbon, mechanical engineers face challenges in getting the data needed to address embodied carbon. Among the causes are Revit models that don’t include the number and brand of various types of equipment, and manufacturers who are slow to issue Environmental Product Declarations (EPDs) for mechanical equipment. These third-party documents, which Chappelle likens to “a nutritional facts label,” are essential for understanding the amount of embodied carbon in any piece of equipment. Unfortunately, as she points out, “a lot of vendors haven’t even heard of an EPD.”

To address this issue, IMEG and other firms aligned with MEP 2040 are strongly encouraging manufacturers to provide this information; some firms, including IMEG, are even signaling that future design specifications may require it.

Meanwhile, IMEG has efforts underway to integrate design tools with available databases to provide real-time feedback. “Ideally in the future, this is going to be some kind of automated calculation,” Lindsey says, allowing engineers to immediately see the carbon implications of their design choices.

Lindsey is excited to be helping to bring clarity to a once opaque aspect of building design. “There's always just been kind of a rule of thumb applied to the embodied carbon of MEP systems, and no one's taken the effort to calculate it. So it's exciting to just have the numbers and be able to back it up with reasonable resources and assumptions, see the overall carbon emissions related to a project, and then be able to make some great design decisions.”

To learn more, listen to part one in this series or read IMEG’s 2026 Whole Carbon Action Plan.

First in a three-part series.

Can an engineering firm reach net zero embodied and operational carbon on all its projects by 2050? If so, what must be accomplished between now and then? Answers to these questions and more are discussed in this episode featuring IMEG’s Director of Sustainability, Adam McMillen.

Adam has been working with IMEG’s multidisciplinary Sustainable Design Task Force to issue the firm’s 2026 Whole Carbon Action Plan, or WCAP. The 2026 WCAP is the third iteration of IMEG’s carbon reduction initiatives; the 2024 plan—then a structural-only document—was the first in an annual requirement of the embodied-carbon-focused SE 2050 Commitment Program. Since then IMEG has expanded its plan to include MEP and civil infrastructure initiatives. The 2026 WCAP therefore provides a comprehensive strategy for reducing embodied and operational carbon, continuing to align with SE 2050 as well as with MEP 2040, the mechanical-focused initiative. IMEG’s multidisciplinary plan is unique to the industry.

“It's one of our biggest differentiators,” Adam says of IMEG’s approach. “All these initiatives are in sync and everything's speaking the same language. We see the Whole Carbon Action Plan as an opportunity to simplify and streamline things as one solution—one low-carbon approach—that a client can really get behind.”

The WCAP is divided into four sections: Education, Report, Reduce, and Advocate—each one delineating individual and multidisciplinary goals and tasks, completed goals and tasks, and the tools that have been or will be created by IMEG to assist its designers in delivering time-efficient, scalable sustainable solutions.

While all sections of the WCAP are critical, the first, Educate, provides the means for achieving quick reductions at no additional cost. For example, just by understanding what embodied carbon is and the differing carbon levels of materials can have a big impact. “It’s a huge opportunity just to understand that if I choose recycled content in my steel, that makes a big difference,” says Adam. “Finding five to 10 things per discipline and getting people to “do this, not that” can lead to significant carbon reductions with no cost to the owner.”

The firm’s use of artificial intelligence does create a carbon footprint of its own from the energy used to run the computations at data centers. However, IMEG tracks its carbon footprint and has found that the project carbon reductions enabled by its sustainable designs far outweigh the AI carbon footprint of the design process. “For every one ton of carbon that we use by allowing AI to help us make better decisions, we reduce by 10,000 tons the carbon footprint of our projects,” says Adam.

How realistic is IMEG’s goal of achieving net zero embodied and operational carbon on all its projects by 2050?

“That’s a great question,” says Adam. “Yes, we're taking a risk by saying we're going to reach that. But why not set the framework to try?”

To learn more, read IMEG’s 2026 Whole Carbon Action Plan