Tata Indica advertisement seduces with more. More power. More space. More style. With these three come-ons and a competititive price tag to boot. Ratan Tata should be laughing all the way to the bank. But not if some environmentalists have their way. Because it runs on diesel also, And diesels, the greens say, belch out more noxious emissions than petrol engines. In fact, the Environment Pollution (Prevention) Control Authority (EPA), a statutory body set up by the Supreme Court to help Delhi combat air pollution in the National Capital Territory (NCT) , recently proposed a ban on registrational of diesel cars in Delhi.