Companies

Monitors and TV screens left idle (on sleep mode, not turned off) all night
Computers still on, either on sleep mode or simply with the current user session locked, sometimes with the screen on, all night
Power supplies plugged all night
Cleaners who clean the bathrooms and empty the trash bins 3 times a day, early in the morning, right after lunch and in the early evening, while once would have been enough (early morning or evening would do).
Use of toxic deodorizers in the bathrooms
Lighting at night
Plastics cups dispensed by coffee machines and water dispensers
Setting to sugar by default on coffee machines; forced to manually select "no sugar"

On the streets