Absolutely! Even more so! I live in Bali with a population of 673 people per sq/km. The island can sustain itself just with the food it grows. I did the math and we can support 42 billion people on the livable land on the earth with that population density.

Further organic (this isn't even biodynamic which does even better) farming outperforms conventional farming.

"Is organic farming more resilient, higher yielding, more energy efficient and more profitable? The Rodale Institute's latest report of a 30 year trial says it is. Read the full report here."