A paradox exists in nature in that one of the most abundant compounds - nitrogen - is in a form that cannot be used by most living organisms, including agricultural plants. As a result, nitrogen availability to primary producers, such as plants, is one of the major limiting factors in many ecosystems, including agricultural systems [1]. Modern agriculture has been able to overcome this limitation and feed a large global population through the addition of commercial fertilisers, the nitrogen content of which originates primarily from ammonia produced by the industrialised Haber-Bosch process. However, the high temperature and pressure required for ...