In California, the real estate developer Marisol Malibu made waves when they sold a supposedly green $23 million mansion with nine bathrooms, 20 ft. ceilings, golf greens, a heated saltwater pool, a driving range, and ocean views to boot. The home’s “zero carbon” credentials include bespoke sustainable concrete and timber, water filtration, and Tesla batteries. These days, many luxury projects like the one in Malibu brand themselves as climate-friendly.