How many people can Hawaii feed? Different diets require different energy inputs. Since meat is higher in the food chain than grains, the more calories you get from meat, the more agricultural land you use. About 1 GJ metabolizable energy is produced annually/hectare for meat and 30 GJ metabolizable energy produced annually/hectare for grain.

Hawaii has about 1.3 million acres of zoned agricultural lands and forests. In that, 675,000 ac are designated as prime agricultural lands of importance to the State of Hawaii of which less than 200,000 ac are under cultivation [58].

Assuming all 675,000 ac of prime agricultural land is used for food production, and the average daily energy requirement for a human is about 2000 kilocalories/day \((\mathrm{kcal} /\) day), answer the following questions:

- How many vegetarians could Hawaii feed? Determine this as an absolute number, percent of 2010 population, and percent of estimated 2030 population.

- How many typical Americans could Hawaii feed? (The typical American gets two-third of his/her calories from meat and one-third from grain)? Again, determine this as an absolute number, percent of 2010 population, and percent of estimated 2030 population.

Clearly state all assumptions made and sources of information used. Show your calculations. Take care to convert units as needed (acre-to-hectare and kcal/day-to-GJ for example). 1 food Calorie (with a capital "C") = \(1 \mathrm{kcal}\). Here is an excellent unit conversion website: http://www.onlineconversion.com/