Environmental News Network: The catastrophic crash of an oil-carrying train in the province of Quebec last month, which devastated the town of Lac-Mégantic and killed dozens, has brought the Keystone XL pipeline into the headlines again. For many environmentalists, the train crash is just one more reminder of the risks of fossil fuel production that the train was carrying tar sands oil was, as it were, the icing on the cake. Conversely, for many supporters of the pipeline, the train crash proves that we need Keystone. But...