Montreal Protocol as climate playbook

The Montreal Protocol’s rapid global phase‑out of ozone‑depleting chemicals is a concrete case study showing how treaty design, industry substitutes, and monitoring combined to reverse an environmental catastrophe. Treating that sequence as an explicit ‘playbook’ — from scientific attribution to diplomatic bargaining and technology deployment — yields transferable tactics for the climate, biodiversity, and other global commons problems. — Framing the ozone success as a practical template reframes policy debates from despair to implementable steps and shifts attention to specific negotiable levers (substitutes, enforcement, monitoring) rather than abstract inevitabilities.