Per-capita emissions are the highest in the US, Canada, and Australia [1]. The US is also the second-largest emitter of CO2. There is much to be gained by focusing on emissions in the US. Unfortunately, most USians would like a large house with yard, 2+ large cars, etc.

Also think about cultural projections -- Hollywood often depicts wealthy people shuttling around in large, inefficient SUVs. These images and aspirations are then transmitted to the rest of the world.

https://www.ucsusa.org/global-warming/science-and-impacts/sc...