AFP: Poisonous pesticides, soil pollution and water waste: high-street fashion has a lot to answer for in the environmental game. But can big brands use their global clout to drive the green revolution? If green is the new black on the high-street, then global retailers are lining up to parade their eco-credentials, from Marks and Spencers in Britain, to sportswear behemoth Nike or the fashion giant H&M. “There’s a paradigm shift in the textile sector,” John Mowbray, editor of …