Ep. 201: Hiro Technologies - Plastic-Eating Fungi & Nature's Favorite Diaper (feat. Tero Isokauppila)

Tero Isokauppila, founder of Four Sigmatic and now Hero Technologies, reveals a radical solution to one of the planet’s most intractable waste problems: plastic-eating fungi engineered to decompose disposable diapers—now the number one source of household plastic waste. What began as a personal crisis during his son’s diaper changes led to four and a half years of global research, collaboration with mycologists, and engineering breakthroughs to create a shelf-stable, dormant fungal formulation that activates when exposed to moisture in landfills. Unlike chemical enzymes that require constant reapplication, Hero’s living fungi reproduce and adapt, creating a self-sustaining remediation system. The technology leverages nature’s own evolutionary tools—fungi that have broken down lignin in trees for millions of years—now repurposed to tackle synthetic plastics with similar carbon structures. The real innovation isn’t just the science, but the system: a scalable, safe, and deployable solution that works within existing waste infrastructure, with no need for consumer action beyond normal disposal. Isokauppila argues that the future of sustainability isn’t about rejecting industry, but conscripting it—using biology to evolve, not replace, the systems we already have. The episode dismantles myths about greenwashing and biotech overreach. Hero avoids CRISPR and genetic engineering, opting instead for natural selection and strain optimization.