Why does this UK river keep turning green? That's the question that's being discussed in the High Court as one of the UK's largest chicken producers and a water company are being accused of polluting the rivers Wye, Lugg and Usk. More than 4,500 people who live or work near the rivers along the Welsh-English border have signed up to take part in what's being seen as a landmark case against Avara Foods and Welsh Water. The two companies have respectively called the claims "misconceived" and "misguided". Tap the link in @BBCNews's bio to find out more about the legal case. #RiverWye #HighCourt #BBCNews