Ammonia production takes place worldwide, mostly in large-scale manufacturing plants that produce 183 million metric tonnes[1] of ammonia (2021) annually.[2][3] Leading producers are China (31.9%), Russia (8.7%), India (7.5%), and the United States (7.1%). 80% or more of ammonia is used as fertilizer. Ammonia is also used for the production of plastics, fibres, explosives, nitric acid (via the Ostwald process), and intermediates for dyes and pharmaceuticals. The industry contributes 1% to 2% of global CO
2.[4] Between 18–20 Mt of the gas is transported globally each year.[5]