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But can biofuels really replace petroleum products?
An EU Commission action plan on alternative fuels for transport identifies biofuels as the most realistic substitute for conventional petrol and diesel in the short term.
Soot is a product of incomplete combustion, especially of diesel fuels, biofuels , coal and outdoor biomass burning.
The U.S. Department of Energy aims to replace 30 percent of the liquid petroleum transportation fuel with biofuels by 2025.
In addition, the incentives for alternatives - such as hydro, solar, nuclear and - crucially biofuels - grow exponentially.
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