Here's a breakdown of the inputs and outputs for an autotrophic community of 20 people, along with food estimates for a 3-month period: ## Community Inputs and Outputs: ### Daily: - O2 consumed: 11,000 L - CO2 exhaled: 9,000 L - Water consumed: 54 L - Food calories: 40,000-50,000 kcal - Urine excreted: 30 L - Solid feces: 2.56 kg - Water lost to evaporation: 18 L ### Weekly: - O2 consumed: 77,000 L - CO2 exhaled: 63,000 L - Water consumed: 378 L - Food calories: 280,000-350,000 kcal - Urine excreted: 210 L - Solid feces: 17.92 kg - Water lost to evaporation: 126 L ### Monthly (30 days): - O2 consumed: 330,000 L - CO2 exhaled: 270,000 L - Water consumed: 1,620 L - Food calories: 1,200,000-1,500,000 kcal - Urine excreted: 900 L - Solid feces: 76.8 kg - Water lost to evaporation: 540 L ## Staple Foods for 3 Months (90 days): Ordered by calorie density (highest to lowest) 1. White Rice - 3,660 kcal/kg - Needed: 370 kg - Estimated cost: $370 ($0.45/lb) 2. Pasta - 3,570 kcal/kg - Needed: 380 kg - Estimated cost: $760 ($0.90/lb) 3. Brown Rice - 3,530 kcal/kg - Needed: 385 kg - Estimated cost: $770 ($0.90/lb) 4. Breakfast Cereal (average) - 3,500 kcal/kg - Needed: 390 kg - Estimated cost: $1,560 ($1.80/lb) 5. Quinoa - 3,680 kcal/kg - Needed: 365 kg - Estimated cost: $1,825 ($2.25/lb) 6. Black Beans (dry) - 3,410 kcal/kg - Needed: 400 kg - Estimated cost: $800 ($0.90/lb) 7. Pinto Beans (dry) - 3,470 kcal/kg - Needed: 390 kg - Estimated cost: $780 ($0.90/lb) 8. Potatoes (dehydrated) - 3,430 kcal/kg - Needed: 395 kg - Estimated cost: $1,975 ($2.25/lb) 9. Sweet Potatoes (dehydrated) - 3,600 kcal/kg - Needed: 375 kg - Estimated cost: $1,875 ($2.25/lb) ### Additional Non-Perishable Staples: 10. Canned vegetables (mixed) - 300 kcal/kg - Needed: 450 kg - Estimated cost: $900 ($0.90/lb) 11. Canned fruits (mixed) - 700 kcal/kg - Needed: 195 kg - Estimated cost: $390 ($0.90/lb) 12. Nuts and Seeds (mixed) - 6,000 kcal/kg - Needed: 225 kg - Estimated cost: $2,250 ($4.50/lb) ### Fresh Produce and Perishable Items: - Weekly estimate: 100 kg - Estimated weekly cost: $300 ($1.35/lb average) ### For 3 months: - Total fresh produce: 1,200 kg - Total estimated cost: $3,600 # Total food cost estimate for 3 months: Approximately $17,855