After comparing all the different technology options, it becomes clear that hybrid technology represents a realistic solution for drastically reducing emissions, including CO{sub}2. When comparing vehicle CO{sub}2 e-missions, it is necessary to take into account not only the emissions when the vehicle is in operation, but also the emissions from the upstream processes, such as mining, refining, reforming, transport and filling up with fuel, as these vary significantly depending on the type of fuel, Figure 1. This concept is referred to as "Tank to Wheels" and the fuel production and distribution component is known as "Well to Tank". Combining these two concepts results in "Well to Wheels". A meaningful approach to future prospects is to compare the CO{sub}2 emissions of hybrid vehicles in terms of Well to Wheels with those of other technologies, such as petrol engines, diesel engines, CNG engines and fuel cells.
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机译：在比较了所有不同的技术选择之后，很明显，混合技术代表了一种切实可行的解决方案，可大幅减少包括CO {sub} 2在内的排放。在比较车辆的CO {sub} 2排放时，不仅要考虑车辆运行时的排放，还要考虑上游过程（如采矿，精炼，重整，运输和填充）的排放取决于燃料，因为它们根据燃料的类型而有很大不同，图1。此概念称为“油箱到车轮”，燃料生产和分配组件称为“油箱到油箱”。将这两个概念结合起来可得出“ Well to Wheels”。一种对未来前景有意义的方法是将混合动力汽车在“从车轮到油井”方面的CO {sub} 2排放与其他技术（例如汽油发动机，柴油发动机，CNG发动机和燃料电池）的排放进行比较。
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