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Ethical factors in food choices

As production has increased to feed a growing population, production of food can have some harmful effects, with impact on:

Environments (habitats, biodiversity, pollution)
People (mistreatment of workers, displacement of populations, inequities if food availability)
Animals that are slaughtered for meat

Along with health-value, convenience, and cost, many are increasingly considering ethical factors as they select or reject specific items. Some options include:

Free range
Fair trade
Buy local
Harvest your own
Independent (vs. corporate)
Packaging (plastic, paper, refillable, etc.)

Ethical issues in food and agriculture. 
…..Food and Agriculture Organization (FAO). United Nations
Abusing chickens we eat. Nicholas Kristof, NY Times
The spiritual side of hunting