Original sentence: Cellulosic ethanol is a new approach which will double yields.Growing demand for ethanol in the United States has already increased corn prices by 50% in some parts of rural Mexico.However, cellulosic ethanol can be produced from any plant material, there would be no conflict between the need for food and the need for fuel.Instead of just taking the grain from wheat and grinding that down to get starch and gluten, then just taking the starch, cellulosic ethanol production involves the use of  the whole crop.Large-scale 'energy farming', necessary to produce agricultural alcohol, requires substantial amounts of cultivated land.Related concerns which have been raised are a decline in soil fertility due to reduction of organic matter, a decrease in water availability and quality, an increase in the use of pesticides and fertilizers, and potential dislocation of local communities.Some have claimed that land is acquired through deforestation, but others have pointed out that areas which support forests are usually not suitable for growing energy crops.There is also a concern that, as demand for ethanol fuel increases, food crops may be replaced by fuel crops, driving food supply down and food prices up.This new approach will also have a smaller carbon footprint because the amount of energy-intensive fertilisers and fungicides will remain the same, for a higher output of useable material
Edited sentence: As demand for ethanol fuel increases, food crops are replaced by fuel crops, driving food supply down and food prices up.Clearance of new land often involves burning, which results in heavy carbon dioxide emissions.Deforestation leads to a loss of wildlife habitat , a decline in soil fertility due to reduction of organic matter, a decrease in water availability and quality, an increase in the use of pesticides and fertilizers, and potential dislocation of local communities.Diminishing supply increases the need to import, which forces food prices even higher.Growing demand for ethanol in the United States has already increased corn prices 50% in some parts of rural Mexico.Large-scale 'energy farming', necessary to produce agricultural alcohol, requires substantial amounts of cultivable land with fertile soils and water.Promoted as an environmentally sound alternative to fossil fuels, ethanol production presents a number of disturbing challenges