Transforming tar sands into crude is costly as well as dirty: the process only becomes profitable with oil prices in the $60-85 range or higher.

把焦油沙转换成原油不仅费用昂贵而且对环境造成污染。当油价在60-85美元范围波动或允许再高一点,这种提炼过程才有利可图。

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But whether Canadian tar sands or Venezuelan heavy crude, more thick oil means more CO2 in the atmosphere. And that means a climate ever more hellish.

然而无论是加拿大沥青砂还是委内瑞拉的重油，成分越稠就意味着大气中的二氧化碳会变得更多，也意味着气候会变得更加恶劣。

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But whether Canadian tar sands or Venezuelan heavy crude, more thick oil means more CO2 in the atmosphere. And that means a climate ever more hellish.

然而无论是加拿大沥青砂还是委内瑞拉的重油，成分越稠就意味着大气中的二氧化碳会变得更多，也意味着气候会变得更加恶劣。

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