Joining the podcast this week is Bruce King, an engineer, author, filmmaker, and one of the leading voices in sustainable and bio-based building materials. He is the author of the book Build Beyond Zero: New Ideas for Carbon-Smart Architecture. Bruce spent more than 45 years in structural engineering, working on everything from high-rise buildings to resort projects, before shifting his focus toward a bigger question: how do we build in a way that works with nature instead of against it? Today, Bruce's work spans everything from straw composites and low-carbon concrete to emerging bio-materials like mycelium, bacterial cellulose, and algae-based construction systems.