Grist: Banking giant Citigroup recently issued a report [PDF] that ought to thrill fans of renewable energy. However, tucked inside the good news is a pill that some greens will find difficult to swallow. The good news is that Citi expects renewable energy to triumph; it believes that typical forecasts like those from the International Energy Agency are too pessimistic. Contrary to a certain strain of conventional wisdom, it says, shale gas will not crowd out renewable energy. Quite the opposite. The...