This study explores the impact of climate change mitigation technologies related to transportation on CO2 emission from 15 European Union countries using an ARDL model. The results from the study take time between 1995 and 2014 and they show that climate change mitigation technologies from transport don't have an impact on carbon emissions and they are not the main asset to reduce them. However, this reduction has its basis on the part of renewable energy in total energy consumption (solar, hydroelectric, geothermal, biomass, and wind) and countries' wealth. For example in France, the employment of energy efficiency on transports and the development of biofuels have shown a reduction in transport emissions (INSEE, 2017). Besides, people's behavior is evolving (supposing more environmentally friendly due to an increase in their richness), thus, adding value as another factor in the diminution of carbon emissions from transport compared to the massive use of green technologies in this sector.