TDT 2.02 Carbon Footprint of Coffee Processing & Milling

The major contribution to the carbon produced at the wet mill is the methane and other greenhouse gases released in the wastewater. In Kenya, where traditional washed processing uses large amounts of water for fermentation, untreated wastewater accounted for 97% of the emissions from processing (JJ Maina et al., 2015). In Costa Rica, Killian et al. (2013) found that emissions from untreated wastewater contributed 79% of the emissions at this stage and 32% of the total emissions of coffee production. Across Central America and Colombia, van Rikxoort et al. (2014) found that emissions from fermentation and wastewater made up 57% of the total carbon footprint of parchment coffee. 

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