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Control methods for artificial ecosystems are commonly required for life-support system in spacecrafts, indoor greenery in houses, rooftop greenery on buildings and organic farming in fields. Such artificial ecosystems are diverse complex systems, which consist of enormous agents such as plants, microorganisms and resident humans. To model and to control diverse complex systems, a theory about emergence of order in diverse complex systems and an adaptive control method are proposed. Self-organization in a diverse complex system performs order. If number of individuals and biodiversity in an artificial ecosystem are sufficiently large, its dynamics is changed into simpler dynamics. The order can be modeled as a simple model, then we can control the artificial ecosystem based on predictions by its model.