Climate change is disruptive. Rising greenhouse gases are eating the globe faster than has ever occurred before, and millions have been affected by record-breaking intense, extreme weather, such as unexpectedly severe hurricanes, heatwaves, and forest fires. What makes disruption dangerous? Predictability, scale, speed and reversibility are good guides. Further, I will discuss what the governor of the Bank of England, Mark Carney, calls “Transition Risks.” There are many potentially win-fin policies to be considered. I will discuss some candidate interventions that would benefit both the environment and public health, the substantial barriers that obstruct such changes, and instructive stories of implementation successes and failures. It has been argued that climate change is “not just a challenge, but the greatest public health opportunity of the 21st century.” Come and join the discussion.