Environmental protection should be a primary factor in the evolution of the dominant transportation energy paradigm. This paper takes a fresh approach to this issue by analysing the relationship between conventional and alternative energy sources in transportation, economic growth and emissions. This is a previously unexplored topic in literature, particularly in the United States of America (US), which is analysed in detail here. The paper makes a further contribution to the field by an analysis, based on Tapio indicator, of decoupling between economic growth and CO₂ emissions resulting from both overall energy consumption and energy consumption by the transportation. Empirically, this paper applies an Autoregressive Distributed Lag model by using monthly data from January 2007 to September 2018. A Decoupling Indicator was calculated by using yearly data from 2006 to 2018. Main findings suggest that alternative energy sources have not yet reducing the dependence of the transportation sector on fossil fuels. Additionally, although the use of renewable fuels by transportation reduces CO₂ emissions, it also hampers economic growth, while economic growth has a negative effect on emissions. This finding is further supported by the decoupling statuses found. I Improvements in energy efficiency appear to have been effective for environmental protection.

环境保护应该是主导交通能源范式演变的主要因素。本文通过分析传统能源和替代能源在交通、经济增长和排放方面的关系，对这个问题采取了新的方法。这是文献中以前未曾探索过的话题，特别是在美利坚合众国 (US)，这里将对其进行详细分析。本文通过基于 Tapio 指标的经济增长与 CO ₂脱钩分析对该领域做出了进一步贡献总能源消耗和运输能源消耗所产生的排放。实证上，本文利用 2007 年 1 月至 2018 年 9 月的月度数据应用自回归分布式滞后模型。利用 2006 年至 2018 年的年度数据计算了脱钩指标。主要发现表明替代能源尚未降低对能源的依赖。运输部门使用化石燃料。此外，虽然交通运输使用可再生燃料减少了CO ₂排放，但它也阻碍了经济增长，而经济增长对排放有负面影响。发现的解耦状态进一步支持了这一发现。I 能源效率的提高似乎对环境保护很有效。