If there's a single theme running under everything in this series, it's trust — or the lack of it. This episode opens with a tower block in Leicester where residents turned down a genuinely good retrofit because they'd been lied to too many times before. Nicholas makes the case that the trust deficit isn't just a soft problem on the side — it's the reason retrofits fail even when the technology is right. In Milan, 500 tenants in comprehensively upgraded social housing used 80% more energy than predicted, largely because they didn't trust the new systems enough to actually use them as intended.

The flip side is just as striking: a community solar project in Boston, run through local faith communities with real cooperative governance, achieved higher enrollment in low-income neighborhoods than wealthier ones — because the messenger w ...