I started this project by looking into how societies and individuals interact and relate to rivers as an example of our unbalanced relationships with ecological systems. I choose this example due to the breadth and depth at which rivers have and do cross through societies. My research developed into gaining an understanding of how river health is defined, measured and the current threats to freshwater ecology. I found through a range of interviews, river visits and literature that comparison of rivers under analysis to rivers (or models) unaffected by human interaction is essential to understanding river health (Milne. Ian, SEPA, 2019, Karr, 1999). Also, that as other pollution levels are decreasing micro-plastics pollution has been increasing at an alarming rate within rivers having a deadly impact on the freshwater ecosystem of which the extent is not known.