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Researchers from University of Cambridge, UK, have quantified that two thirds of emissions from fertilisers take place after they are spread on fields, with one third of emissions coming from production processes, the study said. The researchers have calculated the carbon footprint for the full life cycle of fertilisers, the study said. Fertilisers are responsible for approximately five percent of total greenhouse gas emissions, the first time this has been accurately quantified, and found that carbon emissions could be reduced to one-fifth of current levels by 2050, the study said. The single most effective way to reduce fertiliser-associated emissions, however, would be to reduce the amount of fertilisers that we use.