Source?
https://www.thespruce.com/how-many-vegetables-per-person-in-...
> To grow all the food for one person's needs for the whole year requires, for most people, at least 4,000 square feet—though some diet designs are possible that can use a smaller area.
https://permaculturism.com/how-much-land-does-it-take-to-fee...
> A 0.44 acre of land can produce enough vegetables and fruits to meet up with the daily calories needed for one person to feed for a year.
Food and Agriculture Organization of the United Nations, 1993:
> It is realistic to suppose that the absolute minimum of arable land to support one person is a mere 0.07 of a hectare–and this assumes a largely vegetarian diet, no land degradation or water shortages, virtually no post-harvest waste, and farmers who know precisely when and how to plant, fertilize, irrigate, etc.
> The minimum amount of agricultural land necessary for sustainable food security, with a diversified diet similar to those of North America and Western Europe (hence including meat), is 0.5 of a hectare per person. This does not allow for any land degradation such as soil erosion, and it assumes adequate water supplies.
Cut out meat and it gets better, but not that much better.
A garden is great, but it's not gonna solve a global food crisis.
Victory gardens, also called war gardens or food gardens for defense, were vegetable, fruit, and herb gardens planted at private residences and public parks in the United States, United Kingdom, Canada, Australia and Germany during World War I and World War II. In wartime, governments encouraged people to plant victory gardens not only to supplement their rations but also to boost morale. They were used along with rationing stamps and cards to reduce pressure on the public food supply.
"One 4 × 4 Square Foot Garden box (16 square feet) will supply enough produce to make a salad for one adult every day of the growing season." [0]
0. Bartholomew, Mel. All New Square Foot Gardening, 3rd Edition, Fully Updated: MORE Projects NEW Solutions GROW Vegetables Anywhere (p. 61). Cool Springs Press. Kindle Edition.