Business Green: There’s good and bad news from a sweeping new report on the world’s water scarcity out this week from McKinsey & Co., and commissioned by such water-dependent companies as Coca-Cola, Nestle, SAB Miller and Syngenta, along with the World Bank/International Finance Corp. The bad: Global demand for water already exceeds supply – about 1.1 billion people don’t have access to clean water – and the so-called water gap is increasing at an accelerating rate. The good: …