Santa Cruz also has a green belt. But instead of encouraging density and all the environmental benefits of density, the aging political crew that enacted it now prefer sprawl, since they have their single family single story homes that continue to appreciate at astronomical rates. (At least until the homes are bought as tear-downs and replaced with single-family two story homes that extend to all corners of the property to maximize square footage.)
But if anybody can change attitudes, it's probably Apple or Google.