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Synthetic ammonia is essential for agriculture, but its production at present is unsustainable. Ammonia synthesized with hydrogen from renewable-powered electrolysis and nitrogen separated from air has the potential to alleviate these sustainability concerns while also having promise as a low-cost storage medium for intermittent renewable energy. This paper reviews recent research and development on the topic of renewable ammonia production and utilization as fertilizer and as energy storage. We describe our vision for synergistically combining these renewable ammonia applications to improve sustainability. Furthermore, we outline opportunities for systems engineering to play a crucial role in advancing the adoption of renewable ammonia in a manner which is sustainable, economically competitive, and reliable.