Alternative fuels are derived from non-petroleum sources. Biofuel, ethanol, methanol, hydrogen, coal-derived liquid fuels, electricity, natural gas, propane gas, or a synthetic transportation fuel are all examples of alternative fuels. Most are developed domestically lessening our reliance on imported oil, or from renewable resources. They emit less pollution than gasoline or diesel in many cases. Conventional fuels are not only harmful for the environment, but they're also inconvenient to use. People can now use alternative fuels to power their vehicles without needing to drive somewhere.