Following the CO2 supply problem in autumn 2021,  DEFRA want to understand contingency plans suppliers have in place. Timelines are tight and DEFRA have asked for returns to be submitted by COP Monday 11 April. Please submit your returns to Emma Quarterman ( and Lucia Capodieci (

Within the production process for CO2, ammonium nitrate, ammonia and nitric acid are also critical inputs outputted in the same process. As horticulture is a critical sector that uses ammonia gas or nitric acid, DEFRA want to understand what contingency plans you companies have in place should a shock to these markets, like the shock to the CO2 market last year occur.