What does the term 'biological loop' in the circular economy refer to?

The term 'biological loop' in the context of the circular economy specifically refers to the utilization of renewable resources and organic waste. This concept emphasizes the importance of returning organic materials back to the environment in a way that is beneficial, effectively creating a closed-loop system where waste is minimized and nutrients are reused. By incorporating biological processes, such as composting or anaerobic digestion, organic waste can be transformed into valuable resources like compost or biogas, which enhance soil fertility and contribute to sustainable agricultural practices.

This approach contrasts with merely recycling non-biodegradable materials, which does not align with the biological loop's focus on organic matter. Although enhancing soil health is a significant outcome of the biological loop, it represents just one aspect of a broader system of utilizing organic materials. The removal of pollutants, while an important environmental goal, does not directly relate to the core principles of the biological loop, which concentrates on the regenerative use of biological resources. Thus, option C accurately encapsulates the essence of the biological loop within the circular economy framework.