In the conclusion of his two-part journey, Simon investigates the environmental challenges facing Cornwall and the rest of the country. He discovers how the region's farmers are adopting new, less intensive approaches that are both more profitable and environmentally friendly, and reveals how reintroducing beavers to the uplands could tackle the problem of widespread flooding. He also encounters some of the county's iconic wildlife, including grey seals that live in constant risk of getting caught up in discarded fishing nets