Population Density of Cities

http://www.citymayors.com/statistics/largest-cities-area-125.html

Take even the largest cities.

NYC metro area at 18M and 7000 sq km. That is still only 6 people per acre. But note this is not just Manhattan, but a much larger area that includes beaches and parks.

7000 sq km is 1.7M acres. So about 10 people per acre. By the same density, Factor e Farm would need to have only 300 people to achieve the same density. And the question is - can 100% sustainability happen at the scale of Factor e Farm to match the population density of NYC, but in a completely ethical and healthy way?

But, if we take NYC proper - from a List of USA Cities - 8 M people per 300 sq miles.