Subsistence is the food necessary to sustain life. The following is a list of subsistence techniques: Hunting and Gathering techniques, also known as Foraging: freeganism — involves gathering of discarded food in the context of an urban environment (eg by dumpster diving, ...]. gleaning — involves the gathering of food that traditional farmers have left behind in their fields. Cultivation: Horticulture — plant cultivation, based on the use of simple tools. subsistence… (More on Subsistence)