Date of Graduation


Document Type


Degree Name

Bachelor of Science in Chemical Engineering

Degree Level



Chemical Engineering


Kim, Daesoo


Life cycle assessment is performed to determine the environmental impacts of the life cycle of a product. In this study, the greenhouse gas emissions from milk production in the United States were calculated using a cradle-to-gate analysis. The dairy industry has a noticeable impact on the total greenhouse gas emissions in the US. Performing life cycle assessment provides information about the main emission sources in the life cycle which can spark innovative changes to reduce these emissions. The life cycle assessment was performed using the openLCA software and ReCiPe impact assessment methodology. The results indicated that 1.28 kg of carbon dioxide equivalent (CO2eq) per kg of fat and protein corrected milk (4% fat, 3.3% protein). Enteric and manure management emissions contribute the largest impact (45% and 24%, respectively) on the total emissions from the life cycle. The results from this study are comparable to other life cycle assessments of milk production. Opportunities to reduce greenhouse gas emissions on the dairy farm are present but further research must be conducted to make sure that there are not environmental burden shifts or trade-offs occurring when changes are made to the system.


Life cycle assessment, milk production, environmental impact, dairy industry