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“,” a documentary featuring��Mija Hubler,��associate professor of structural engineering and structural mechanics, was selected as the opening night film for the Colorado Environmental Film Festival in Golden. The film highlights women��transforming the construction industry through sustainable innovation, decarbonization and green technology.

Hubler’s research interests include aging of construction materials, concrete infrastructure design and construction methods and the design of alternative construction materials from biological elements and engineered waste materials. She is a co-founder of��, a bio-cement start-up in Longmont, Colorado.

Tell us about�� “Women of Carbon.

The main three points the film addresses are decarbonization, human health and economic opportunity. The focus is on efforts to decarbonize the construction materials and the motivations behind that work. It explores why a number of women are leading efforts to address these challenges.

How did you become involved in this documentary?

The documentary was Director Basia (Myszynski)’s��idea. She contacted me and asked to visit our labs. She interviewed me twice—once when she started the project and then a year later, after she interviewed others in the industry. The second time she interviewed me, we met in Longmont, and I showed her around our startup Prometheus so that she could see the technology we developed.

Tell us about the research you described in the film.

Portland cement is the most common type of cement used in construction. Its production requires a lot of energy and releases significant amounts of carbon dioxide into the environment.��

"I never thought actually I would be a woman of carbon," said Associate Professor Mija Hubler. "I always dreamed of big bridges and towers, only to realize that in the future we're not going to be building any bigger bridges or towers, unless we embrace this challenge of carbon all around us."

In the documentary, I talk about two of my research efforts. The first is a new bio-based cement that we developed through Prometheus Materials. It’s a carbon-negative cement which combines microalgae with natural binders to create a sustainable alternative to standard concrete.

I also sketched out a second project that uses a different type of bacteria; this bacteria repairs concrete by sealing cracks. At the time the documentary was being made, the technology was just a vision. Since then, we won the���鶹��Ѱ�����Boulder Embark Challenge for that product and are now launching a new company focused on bringing it to market.��

What drives your passion for your research?��

I've seen incremental evolutions in concrete technology and alternative cements. The biological approach is a significantly new step. It may be harder for industry to embrace, but it could have a much larger impact on this industry’s carbon footprint. And it can also maintain our existing infrastructure because it could be used to repair the cracks in old concrete.

Why did you participate in this documentary?��

It’s an interesting idea to feature women decarbonizing construction materials. Structural engineering, which is what I study, historically was male-dominated. In some of my undergraduate courses, I was the only woman. But as the field included more materials research, it's become a more diverse field.

I also found this project interesting because the documentary format was completely different from the type of media I was used to. It wasn't a research paper. And it turned out to be a big deal! It's the centerpiece of this festival.

What was the most exciting part about being included in this documentary?

I flew to Portland, Oregon, with my family for the Aug. 14, 2025, opening night. At that point, I hadn't seen the film, and I was really impressed.��

Watching the documentary together was a way to share my research with my family in a way that I can't usually do. It was also exciting to sit in the audience. There were high schoolers around me chatting after the movie, saying, "Oh, maybe we could study this."

Your daughter was in the documentary. What did she think about it?

My daughter is now 9. When she saw it a year ago, she was very excited. She told all her friends she was going to be a movie star. The topics were a little bit over her head. But she loved being in it.

What do you hope viewers take away?

I hope high school students take with them the hope and passion for civil engineering. I hope that everyone sees that there's a lot of potential to advance the construction field. We can pursue new construction in a more sustainable way while maintaining existing structures.��

I'm excited to show the film to my friends, family and the community because it feels like the first time I can share my research with them. The documentary gives me a new way to communicate with them about what I do.