如果电能来自使用煤或燃气的发电厂，碳排放依然是存在的。
If the electricity is from a coal - or gas-fired power plant, then there are still carbon emissions from that vehicle's use.
他们也敢在恶劣的环境下冒险寻找石油和天燃气的非传统资源，因为环境没这么恶劣的时候，提炼这些资源成本非常高。
They also venture into harsher climes and seek out unconventional sources of oil and gas that, in happier times, would be too costly to extract.
燃气和燃油的消耗量在天冷时总会增加。
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