Which of the following is an example of an emission metric?

The selection of 'Clean Production: Human Impacts' as an example of an emission metric is appropriate because it encompasses the direct consequences of production processes on the environment, particularly how human activities release pollutants and greenhouse gases into the atmosphere. Emission metrics are typically focused on quantifying emissions related to various activities or processes, and this choice highlights the relationship between production techniques and their environmental footprint.

In contrast, the other options do not specifically represent direct measurements of emissions. Water Eutrophication relates to the nutrient enrichment in water bodies, Biotic Resource pertains to the utilization of living resources, and Sourcing refers to how materials are obtained or procured. While these categories are important in the context of sustainability and environmental impact, they do not specifically measure emissions associated with production activities, making them less relevant as examples of emission metrics.