Bio-fuels that deliver performance rivaling those of fossil fuels used in automobiles are a step in the right direction towards smog-less cities. Unlike bio-fuels, black liquor gasification and GTL transport fuels offer the possibility of reducing fossil fuel consumption without the need to cultivate crops as raw material for bio-fuels, freeing land and water for other uses. Landfill gas and bio gas from farm and food processing waste are sources of fuel that result from effective waste disposal processes.