As the UN Ocean Conference continues in Nice, the Marine Conservation Society aims to remind us that all land and river-based pollution, including agricultural run-off, will end up in the ocean. They're calling for a more joined-up approach to farming and fishing more sustainably.

Scientists at Rothamsted Research have genetically modified an oil seed plant with a red flax to create fish feed that provides antioxidants and the red colour in salmon and shrimp. Though not authorised in the UK, the GM crop would be an alternative to the chemicals currently used.

And it's the second day in our journey of a UK loaf of bread from seed to slice. Today we're with a wheat farmer in Norfolk.

Presented by Anna Hill and produced by Sally Challoner.