We're all worried about gas prices, which seem to hit new highs every day. Scientists have discovered how to synthesize fuel using waste biological materials, like grass and wood chips, into usable oil and gas.

It turns out that many biological raw materials are just a few steps away from oil, and the digestive system of microbes can be genetically engineered to turn them into oil.

The biologically generated fuel consumes greenhouse gases, so unlike regular fuels the amount of CO2 in the atmosphere will actually go down.

The images to the left shows some of the lab equipment used to do the conversion on a small-scale, experimental basis.

The cost: About $50 per barrel, or less than half today's prices.

In short, our cars may no longer excrete greenhouse gases in the future, and the fuel on which they run will be much cheaper. So maybe the SUV has a chance for a comeback.

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