Water usage is probably my biggest. Living in a high desert, my wife and MIL see no problem with filling one side of the sink with hot soapy water to wash a few dishes because “that’s just how I’ve always done it”, to watering the grass and plants for hours. All of this makes me mental.
Private ownership of vehicles should be banned. Most people’s cars are unused for 90% of the day, which is insanely inefficient. Have a pool of cars they anyone can hire just for the time they need them. It would be cheaper for everyone and there wouldn’t be three fuck ugly cars in front of every house.
Problem is that almost everyone is using them at the exact same time every day to get from and to work.
Public transit is more efficient at moving a large number of people at once in similar directions.