The Haber-Bosch reaction, using energy to convert nitrogen gas into ammonia, is now being repurposed, fueled by renewable energy, to produce green ammonia. Green ammonia then becomes the carrier of hydrogen energy to fuel a range of processes, including the mobility of vessels and automobiles. Yet, the massive production of ammonia produced by the Haber-Bosch reaction to yield synthetic fertilizer applied to agricultural soils resulted in a major deterioration of water quality and the proliferation of dead zones in freshwater and coastal ecosystems. The combustion of ammonia results in reactive nitrogen species, such as NOx, which is also a potent green-house gas. To ensure that the green ammonia revolution delivers the environmental benefits it is designed to provide it is essential that policy regulations to avoid leakage of ammonia and reactive nitrogen forms to the environment precede its deployment at scale. New technologies are being proposed to further convert these products into inert N2, achieving circularity in the production and use of green ammonia, which is essential to avoid unintended environmental impacts.