Individuals are, hopefully, voters in a democratically organised society.
A democracy can decide to outlaw certain activities that are harmful to society and the environment. Ecological efficiency would be the determining factor above financial efficiency. Individuals can democratically outlaw the production of foodstuffs destined for and distribution outside of a certain geographical area and thus prevent the inherent packaging and transportation impacts. Industrial agriculture, food production and processing, and transporation belong to the major activities that can be reorganised for a dramatical reduction of our impact on the environment. Below is a summary that may give susbtance to that thought.