After a season of conversations spanning numerous topics, this special edition episode takes a step back to reflect on the bigger themes shaping the future of construction.

Joining Estelle for this recap discussion are David Millar, CEO of the Concrete Institute of Australia, and Clare Tubolets, CEO of SmartCrete CRC.

They revisit some of the most important insights and recurring challenges raised throughout the podcast series — from bridging the gap between research and industry, to navigating sustainability, workforce capability and long-term infrastructure resilience.

Rather than looking at these topics in isolation, this conversation explores how they connect, what the sector still needs to improve, and why collaboration across the entire ecosystem will be critical moving forward.

This episode is both a reflection on how far the industry has come, and a conversation about where it needs to go next.

Sustainability in construction is no longer a side conversation. It’s reshaping the way projects are designed, specified and delivered across the industry.

In this episode, Estelle sits down with Lauren Howe from Arup and Sam Chen from Mott MacDonald to explore how engineering and materials expertise are helping drive the transition toward lower embodied carbon infrastructure.

Rather than focusing purely on future targets, this conversation looks at the practical realities of change — where the industry is already making progress, where barriers still exist, and how collaboration across design, materials and delivery will ultimately determine how quickly we move forward.

From evolving expectations around carbon accountability to the importance of systems thinking and innovation, this episode unpacks what it really means to engineer sustainability into the built environment.

In this episode, Estelle is joined by Ali Kashani from UNSW and Evan Smith, National Sustainability Manager at Holcim, to explore one of the construction industry’s biggest challenges—decarbonising the way we build.

As the push toward net zero continues to accelerate, the conversation around concrete is evolving beyond strength and performance to focus on lifecycle impact, material innovation and smarter decision-making across the supply chain. From low-carbon concrete and Environmental Product Declarations (EPDs) to circular economy principles and emerging technologies like 3D concrete printing, this discussion unpacks what it really takes to make sustainable construction practical, scalable and commercially viable.

Together, they explore the role industry, research and government all play in driving meaningful change, and why collaboration will be critical to building a lower-carbon future.