In each case the analysis differentiates between what might happen with a low, medium or high cost of carbon.

在每个案例中，分析结果都随着碳排放价格的高昂，中等，低廉而有所不同。

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For another, the commercial case for high-speed rail should be strengthened once aviation starts to pay its true environmental costs through carbon pricing.

ECONOMIST: The politics if not the economics are turning in favour