Inside the climate battle quietly raging about US homes

Away from the headlines, there's an important fight happening that is pitting real estate developers and utilities against efforts to make America's new homes more climate friendly

Some challenges to US climate action are obvious - like when Donald Trump boasts about leaving the international Paris agreement and rolling back pollution rules.

But many more play out behind the scenes. One of those is the battle over efforts to make America's new homes and buildings more energy-efficient.