WASHINGTON — Ethanol -- alcohol produced from corn or other plants -- is more energy-efficient than some experts had realized and it is time to start developing it as an alternative to fossil fuels, researchers said Thursday.

While some critics have said the push for ethanol is based on faulty science and mostly benefits the farm lobby, several reviews and commentaries published in Friday's issue of the journal Science argue otherwise.

"We find that ethanol can, if it is made correctly, contribute significantly to both energy and environmental goals. However, the current way of producing ethanol with corn probably only meets energy goals," said Alexander Farrell at the University of California Berkeley.

Farrell and collegases.

"(The environmental cost) comes entirely from making fertilizer, running the tractors over the farm and operating the biorefinery," Farrell said.

Better methods now being investigated would use the woody parts of plants, using what is known as cellulosic technology to break down the tough fibers.

"Ethanol can be, if it's made the right way with cellulosic technology, a really good fuel for the United States," said Farrell, an assistant professor of energy and resources.

"At the moment, cellulosic technology is just too expensive. If that changes -- and the technology is developing rapidly -- then we might see cellulosic technology enter the commercial market within five years."

Writing in the same journal, scientists from Imperial College London, Georgia Tech and Oak Ridge National Laboratory in Tennessee said they had teamed up to find ways to make a facility to do that.

Their facility would make a range of fuels, foods, chemicals, animal feeds, materials, heat and power using what is known as biomass -- a collection of renewable plant matter and biological material such as trees, grasses and agricultural crops.

"We're looking at a future for biomass where we use the entire plant and produce a range of different materials from it," Charlotte Williams of Imperial's Department of Chemistry said in a statement.

"Before we freeze in the dark, we must prepare to make the transition from nonrenewable carbon resources to renewable bioresources," her team wrote.

An oil industry expert said it was possible.

"Credible studies show that with plausible technology developments, biofuels could supply some 30 percent of global demand in an environmentally responsible manner without affecting food production," Steven Koonin, chief scientist for BP in London, wrote in a commentary.

"To realize that goal, so-called advanced biofuels must be developed from dedicated energy crops, separately and distinctly from food."

Source: Reuters