Effects of using renewable fuels on vehicle emissions.

In an effort to reduce greenhouse gas emissions, renewable fuels (biofuels) are being developed and used in motor vehicles. The most common of these are bioethanol and biodiesel that are blended with petroleum based gasoline and diesel fuels at varying percentages. This provides some reduction in the fossil carbon emissions from these fuels. Biomethane (produced from biogas) can and is used as a vehicle fuel to a much more limited extent. Significant modifications are required for the motor vehicle to use biomethane.

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