The document discusses three modern agricultural systems - apartment agriculture, green sponge agriculture, and water recycling. Apartment agriculture uses greenhouses, light, and plants to grow food with a 93.62% success rate and 67% additional revenue. Green sponge agriculture uses greenhouses and recycled water to equally grow plants at low cost, with a 100% success rate and 72.6% additional revenue. Water recycling uses plants to recycle 38% of water at low pollution and cost, generating revenue. The document concludes with a quote about self-sufficiency from the Soviet Union.