InventionA century after the end of the The Advent War, famines and droughts began to take their hold on both Jhoutai and Eden. The reliance on soil and the amount of disasters both natural and synthetic forced the governments of the planets to find alternative solutions. Money was invested into created massive hydroponic facilities in major population centers, and farmers were subsidized to work instead in these facilities rather than working the land. This freed up land for a growing population, and broke reliance on the natural climate and soil.
The first usage of Hydroponics was in the creation of vertical farming. This buildings can be built as tall as skyscrapers and can be responsible for the well-being of entire cities. They can also be used in settlements, to break soil reliance on what might be a dangerous planet.
With the easy recycling of water, hydroponics can be used to sustain or compliment the fare of people who live in Waystations or travel in large Wayships. The greenery can also provide a portion of the air recycling required on ships.
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Were it not for advancements in Hydroponics, I'm pretty sure that the Hubworlds would have been snuffed out. No soil can bear the weight of so many trillions of people.