Scientists have developed lightning-produced ammonia in gas form – a new, more efficient method that is a step closer to the sustainable production of ammonia and, therefore, a transition to a hydrogen-based economy, says the University of Sydney school of engineering and biomedical engineering and Net Zero Institute’s Professor PJ Cullen. University of Sydney researchers have harnessed human-made lightning to develop a more efficient method of generating ammonia – one of the world’s most important chemicals. Ammonia is also the main ingredient of fertilisers that account for almost half of all global food production.