Original sentence: However, scientists, such as David Pimentel and Tad Patzek say that more fossil energy is needed to produce ethanol than it produces, due to artificial fertilizers and oil used for heating during the fermentation process
Edited sentence: However, many scientists, such as David Pimentel and Tad Patzek say that more fossil energy is needed to produce ethanol than it produces, due to artificial fertilizers and oil used for heating during the fermentation process