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These include butanol produced by acetone-butanol-ethanol (ABE) fermentation of biomass, synthetic gasoline gasification produced by gasifying biomass to syngas followed by Fisher-Tropsch reformation, ethanol produced by fermentation of biomass-derived syngas, and biodiesel produced from algae grown in huge saltwater ponds. Metabolic engineering for improved fermentation of pentoses by yeasts.

Algae are the exception in relying on a new “crop” and are also by far the earliest in development.

Despite this, lifecycle analysis indicates biofuels, especially from lignocellulose biomass, can greatly reduce CO emissions and very efficiently reduce net gasoline usage (Farrell et al., 2006).

Major sources of biofuels are ethanol and to a much lesser extent biodiesel.

In fibrous biomass, carbohydrates are mostly present in the plant cell walls and are in the form of cellulose and hemicellulose.

Cellulose can be converted to glucose and hemicellulose to a mixture of sugars, the composition of which varies with the source of biomass. Ethanol can contribute to energy and environmental goals.

Net income of .6 billion increased 4%, driven by a 25% increase in Citicorp net income.

Estimated availability of each is in the hundreds-of-million-ton range (Figure 1) and all summed together could theoretically meet 20 percent of our total liquid transportation fuels by 2017 (Perlack et al., 2005). While ethanol is the leading candidate for a renewably generated liquid fuel, there are other alternatives, some dating back nearly as far as ethanol. Each is being actively pursued for commercialization; limited space prevents further discussion of these alternatives. Carbohydrates are the only portion of the plant that can be fermented to ethanol. Last year 5 billion gallons of ethanol (95 percent from corn) was produced, and production is expected to grow to 10 billion gallons in the next few years (Westcott, 2007). After that any further growth in biofuel production will need to rely on lignocellulosic feedstocks because of competing demands for corn from food, industrial, and export uses (Westcott, 2007). Comparison of the xylose reductase-xylitol dehydrogenase and the xylose isomerase pathways for xylose fermentation by recombinant .

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