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Lightweighting is considered as one of the solutions for reducing transportation emissions. Automobile manufacturers and original equipment manufacturers are seeking novel ways to meet this objective. One of the options for emission reduction would be the use of natural and/or recycled fiber-reinforced composites as these materials are lighter and have low energy demand compared to the currently being used materials. In this study, we tried to examine the impact of the use of hybrid bio-based composites as an alternative to the current materials. Four different under-the-hood parts (battery tray, engine beauty shield, cam cover, and oil pan) were manufactured using hybrid bio-based (carbon/cellulose fiber) composites and compared their environmental emission in terms of the greenhouse gas (GHG) emission as well as the cumulative energy demand. The GHG was calculated in accordance with the Intergovernmental Panel on Climate Change, Fifth Assessment Report, whereas cumulative energy demand was calculated based on the International Organization for Standardization life cycle assessment method. The results of this study indicated a noticeable GHG and energy savings and a promising future for these types of hybrid materials.