Net CO2 or Greenhouse Gas Production
Plants use sunlight and photosynthesis to take carbon dioxide (CO2) out of the Earth's atmosphere to make vegetable oil. The same CO2 is then put back after it is burned in an engine. Thus vegetable oil does not increase the CO2 in the atmosphere, and does not directly contribute to the problem of greenhouse gas. It is really a way of catching and storing solar energy; it is a renewable energy.
However, as with other "renewable" energy sources, there may be a (relatively small) carbon footprint associated with production or distribution of vegetable oil.
Read more about this topic: Vegetable Oil Economy
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