I will occasionally spend time picking up litter when I go on walks. The waste I find, in order of volume, is primarily: 1) Food packaging 2) Automobile det

I will occasionally spend time picking up litter when I go on walks. The waste I find, in order of volume, is primarily: 1) Food packaging 2) Automobile detritus 3) Construction material 2 is because parts fall off of people's cars. 3 is because construction material will fall out of the pickup truck beds that are used by construction workers. But the food packaging waste is dropped by people. If we accept the UX principle that it's easier to change the system than human behavior, then the best way to reduce the volume of litter would be to reduce food packaging waste. For example, if fast food, like McDonalds, were packaged in rapidly bio-degradable and low-pollutant things, like simple, un-dyed paper wrappings, then the amount of waste in the environment would be greatly reduced.