Original sentence: Another study has suggested that replacement of 100% petroleum fuel with E85 (a fuel mixture comprised of 85% ethanol and 15% petroleum) would significantly increase ozone levels, thereby increasing photochemical smog and aggravating medical problems such as asthma.However, the evidence for this claim is mixed.However, this does not hold for all greenhouse gases.This estimate, together with a parameter publishing in the Proceedings of the National Academy of Sciences (PNAS), indicates that this near-maximum level of ethanol production will abate GHG emissions by 0.13% (~1/10 of 1%) of current US GHG emissions
Edited sentence: In addition, at least one recent study has suggested that replacement of 100% petroleum fuel with E85 (a fuel mixture comprised of 85% ethanol and 15% petroleum) would significantly increase ozone levels, thereby increasing photochemical smog and aggravating medical problems such as asthma.This estimate, together with a parameter publishing in the Proceedings of the National Academy of Sciences (PNAS), indicates that this near-maximum level of ethanol production will abate GHG emissions by only 0.13% (~1/10 of 1%) of current US GHG emissions.While the existence of such reductions is not generally disputed, their magnitude relative to total US GHG emissions has not been evaluated by any of the major studies