More than a dozen allied environmental groups launched a new website and TV commercial outlining the environmental and economic threats posed by two aging oil pipelines crossing through the Great Lakes at the Mackinac Straits. The website, OilandWaterDontMix.org, features the new commercial and details the danger posed by the daily flow of nearly 23 million gallons of oil through pipelines lying on the bottom of the Straits just west of the Mackinac Bridge.