Original sentence: However, the estimation of carbon emissions due to ILUC effects has become one of the most contentious issues relating to biofuels, and it has been debated in the popular media, scientific journals, op-eds and public letters from members of the scientific community on both sides of the issue, and criticized by the ethanol industry, both American and Brazilian.On May 2009 EPA  released a notice of proposed rulemaking for implementation of the 2007 modification of the Renewable Fuel Standard (RFS),  which also take into account the carbon emissions resulting from indirect land-use changes, causing additional controversy among ethanol producers and some politicians.The second study, conducted at Princeton University, used a worldwide agricultural model to estimate the indirect land use change impacts of biofuels (ILUC) as the U.This controversy has been intensified by CARB's April 2009 rulemaking including ILUC impacts to define the California Low-Carbon Fuel Standard that will enter into force in 2011
Edited sentence: The second study, conducted at Princeton University, used a worldwide agricultural model to estimate the indirect land use change impacts of biofuels as the U