If we are afraid of nuclear energy mostly because of the possibility of a catastrophic disaster (e.g. Japan), why don't we feel the same way about oil pipelines through wildlife preserves, oil platforms in fisheries, or tankers crossing oceans? Shouldn't the same aversion to risk apply to both forms of energy?More than a week after Exxon told reporters that the pipeline that spilled 42,000 gallons into the Yellowstone River on July 1 carried only sweet crude the company admitted that the line routinely transports crude from the tar sands region. Exxon maintains that the oil that spilled was not of the more heavily polluting tar sands variety.