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Biodiesel fuel (BDF) is a fuel made with vegetable base oil and is getting attention as a new energy resource to replace fossil base resources. We will run out of fossil base oil eventually. But we ca keep growing vegetables (and inedible plants etc.) to make and recycle used oil to make biodiesel. Also, this fuel is carbon neutral.
Carbon Neutral in BDF
Of course, BDF produces carbon dioxide when burned. But over its life cycle, a product or process that does not add more carbon dioxide to the atmosphere. For instance, a plant consumes carbon dioxide while it grows, then when transformed into and used as fuel such as BDF it releases carbon dioxide back into the atmosphere. So BDF has the potential for being carbon newtral.
Greenhouse Gas
Greenhouse gases are components of the atmosphere that contribute to the greenhouse effect. Without the greenhouse effect the Earth would be uninhabitable; in its absence, the mean temperature of the earth would be about -19°C (-2°F, 254K) rather than the present mean temperature of about 15°C (59°F, 288K). Greenhouse gases include in the order of relative abundance water vapor, carbon dioxide, methane, nitrous oxide, and ozone. Greenhouse gases come from natural sources and human activity. (From Wikipedia)