Interview, Fireside Chat
Green building: can mushrooms help?
- The construction sector accounts for 11% of global CO2 emissions, a figure comparable to the combined emissions of Russia and India.
- This impact stems from energy embedded in materials, the energy cost of logistics, and the industry's decentralized nature which hinders rapid adoption of environmental standards.
- Concrete production is a primary source of emissions because manufacturing cement requires heating limestone (calcium carbonate), which intrinsically releases CO2.
- Mitigation strategies are limited to three paths: producing cement more cleanly, reducing overall consumption, or implementing carbon capture technologies.
- Alternative materials include wood, bamboo, quarried stone, waste plastic, and potentially aluminum produced via renewable energy.
- Wood is identified as highly promising due to its embodied energy source (sunlight), fire-resistant capabilities, and mechanical strength.
- Recent lumber price surges have increased wood construction costs, necessitating careful sourcing and regulatory oversight to ensure sustainable harvesting.
- Mycelium (mushroom-based bricks) show potential for specific applications but face significant structural limitations on Earth.
- While viable for low-gravity environments like Mars, mycelium lacks the compression strength required for load-bearing structures on Earth.
- Current research suggests mycelium may be best utilized for insulation rather than structural support.
- Sustainable design prioritizes extending a building's lifespan to decades or centuries through architectural flexibility.
- Designers must balance sustainability with human preference; for example, eliminating windows to maximize energy efficiency may reduce livability.
- Meeting accommodation demands in emerging economies with sustainable materials is currently deemed unfeasible due to the sector's informal and disparate nature in developing nations.
- Governments are advised to facilitate the construction of high-density housing in desired locations to reduce per-capita greenhouse gas output.
- Experts anticipate it will be more challenging to decarbonize construction in developing countries compared to developed ones.