Explain why life cycle assessment is not always completely objective.

Life cycle assessment (LCA) evaluates the environmental impacts of a product throughout its entire life cycle, from raw material extraction to disposal. However, LCAs are not always completely objective due to several factors. These include the subjective nature of assigning numerical values to environmental impacts, which can involve value judgments based on personal or societal priorities. Additionally, the selection of data and the scope of the assessment can influence outcomes, leading to potential biases. Therefore, while LCAs provide valuable insights, they should be interpreted with an understanding of their inherent limitations.