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If the world's 9,000,000,000 people stood together at four people per square meter, they would fit on the Istrian Peninsula. If each person had 1,000 square meters to grow food, the population would fit in an area the size of Brazil. For each four-member family to have 700 square meters for food, the population would fit in Iran.
In 2019, the world population was about 7,700,000,000. A four-member family's vegetable needs can be grown in 200 square meters. The world's arable land, about 31,000,000 square kilometers, could grow enough vegetables for 155,000,000,000 people or over 38,000,000,000 four-member families. There is enough space for everyone, except for greed.