By Rose Hill Alarm bells should be ringing for meat eaters, BBC presenter Chris Packham has warned as he issues a grim prediction for the future if people don’t stop eating chicken. The Springwatch host and Veganuary Ambassador, 62, has explained the bleak reality of chicken farming – and its link to the destruction of UK rivers and Brazillian rainforests, warning one major British river is “on the brink of being declared ecologically dead”. In a video shared exclusively with the Mirror for Veganuary’s Choose Chicken-Free campaign – which aims to raise awareness of the environmental damage and…