fact-checkedpeer-reviewed publicationtrusted sourceproofread Ammonia as an efficient hydrogen carrier and green steel enabler type='text/javascript'> googletag. While the hydrogen-based direct reduction of iron ore is promising, researchers are facing one major challenge: to make the whole steel making process climate friendly, the used energy and hydrogen themselves should be produced in sustainable ways. Moreover, by using ammonia the logistic and energetic disadvantages of hydrogen are overcome and already existing furnace technologies, namely shaft and electric arc furnaces, can be used with only slight modification