Because each barrel of oil emits roughly 0.3 tons of CO2, a carbon tax of, say, $40 per ton of CO2 implies an oil tax of just $12 per barrel. And, because oil prices have declined by more than triple the tax, consumers would continue to pay much less than they did just a few months ago.
消费者仍然有利可图。由于每桶石油大约会产生0.3吨的二氧化碳，因此要让二氧化碳成本达到（比如）40美元/吨，只需要课以每桶12美元的石油税。此外，由于石油价格下跌幅度是这一征税额的三倍多，消费者所面临的油价仍将比几个月前低得多。