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Carbon Costs of Trans Mountain Could Hit $8.7 Billion Up Front, $4.1 Billion Per Year

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The Trans Mountain pipeline expansion will trigger additional greenhouse gas emissions worth C$2.1 to $8.7 billion per year up front, and $675 million to $4.1 billion per year for as long as it operates, based on a social cost of carbon between $45 and $270 per tonne, environmental journalist Stephen Leahy calculated earlier this year in a post for Vice Motherboard.

Although Canada’s government agrees [1] there are real costs to decisions that result in releasing more CO2 into the atmosphere—costs that are reflected in our tax bills, insurance claims, and ill health—politicians never seem to total up those costs,” Leahy writes. So here’s his math:

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