Danger Dust

Once voted the UK’s favourite river, the River Wye flows from the Welsh mountains to the Severn estuary – 150 miles through an officially recognised “national landscape”. But this idyllic picture is changing, as the river is gradually choked by waste from industrial chicken farming.

In the land that feeds into these rivers, millions of chickens are being reared in intensive units to supply supermarkets with cheap meat and eggs. But all those chickens produce vast amounts of manure which can end up in the rivers.

This floods the river with excess nutrients causing algal blooms to flourish. The algae blocks out sunlight and consumes oxygen, which kills other creatures in the water. For instance the number of Atlantic salmon passing through the River Wye each year has plummeted from 50,000 in the 1960s to less than 3,000.

The problems caused by chicken farming have led to legal action against US food company Cargill and its subsidiary Avara Foods (both firms deny the allegations). Meanwhile food outlets including Nando’s have denied sourcing their products from polluting farms.