As for your point about reducing consumption, there has been a deliberate effort by billionaire-controlled corporations to increase consumption. This has been done through a variety of methods, including limiting repairability, deliberate planned obsolescence through things like fast fashion and equipment designed to break down, and psychological manipulation to encourage consumption. Small ‘d’ democratic efforts to limit these techniques have been defeated by powerful lobbies backed by these billionaires.
Billionaires aren’t just responsible for consumption-driven climate change, they’re also responsible for subverting the democratic processes that could have reversed it at large scales.
In dense urban areas we do have good mass transit and it's relatively more common for people to not own a car.
What is the name for the theory that the most fantastically wealthy do not rule society? No kind adjectives come to mind.
Even if the 4000 billionaires are ruling society, they're destroying the planet with the help of 8 billion poors.
If the executive branch of the government is commanding the military, and generals are commanding the military, they’re killing people with the help of tens of thousands of soldiers.