LaGuardia is jammed into just 680 urban acres; taxiways are tight; runways intersect; you can't launch a departure until the arrival on the other runway crosses the threshold or else the airplanes will ... collide.
Natural erosion had reduced the critical barrier islands in the Gulf, the result of the destruction of some 300,000 acres of wetlands. This amounted to 30 miles of marshlands.
Know that each acre of fallow ought to support yearly two sheep at the least, then a hundred acres of fallow can support two hundred sheep, two hundred acres, four hundred sheep and so on.