Every fuel has some effect on the environment. Plants such as soybeans must still be grown and processed; and even biodiesel still produces emissions, though much lower than petroleum diesel.
The increased use of biomass to produce bio-diesel requires careful consideration with respect to its environmental impacts because there are complex impacts such as fertilizer production and use, water use, and fuel processing and transport. There are positive impacts such as reduction in CO2 emissions at the combustion stage. However, agricultural production of biomass is land intensive, requires use of fossil fuels for transport and cultivation, can pollute water with fertilizer runoff and pesticides. Additionally, artificial fertilizer production is very fossil fuel energy intensive. Plus massive commercial mono-cultures reduce biodiversity. Therefore, bio-diesel is harmful to the environment and not a good alternative fuel.
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