There are 149 million square kilometers of land, including all the desert, mountains, jungle and tundra. There are about 7 billion humans. This comes out to 2.12 hectares per person, or in snowflake units, 5.2 acres. An American football field with endzones is 5353 square meters, or 1.33 acres; a pro football/soccer field is 7140 square meters,
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