Washington State has an area of 184827 square kilometers.
247 acres to a square kilometer gives you 45652269 acres, article says 25 tonnes per acre, giving a yield of 1141306725 tons or about 160kg for every person on the planet.
This makes lots of assumptions but even if you half the efficiency you are in the ballpark of 80kg of nutritious plant matter per every person on the planet.
It would also work out at ~1600 shellfish per person on the planet.
247 acres to a square kilometer gives you 45652269 acres, article says 25 tonnes per acre, giving a yield of 1141306725 tons or about 160kg for every person on the planet.
This makes lots of assumptions but even if you half the efficiency you are in the ballpark of 80kg of nutritious plant matter per every person on the planet.
It would also work out at ~1600 shellfish per person on the planet.
Lots of assumptions but it's in the ballpark.