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In page Petroleum industry in Canada:
"A 2017 study by the National Bureau of Economic Research found that contrary to popular belief, the sum of air pollution and greenhouse gas (GHG) emissions costs is substantially larger than accidents and spill costs for both pipelines and rail.[1] For crude oil transported from the North Dakota Bakken Formation, air pollution and greenhouse gas emission costs are substantially larger for rail compared to pipeline. For pipelines and rail, the Pipeline and Hazardous Materials Safety Administration's (PHMSA) central estimate of spill and accident costs is US$62 and US$381 per million-barrel miles transported, respectively.[2] Total GHG and air pollution costs are 8 times higher than accident and spills costs for pipelines (US$531 vs US$62) and 3 times higher for rail (US$1015 vs US$381).[2]
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