The change in the level of emissions of carbon dioxide(co ) resulting from a switch towards biofuels is much more debatable. The EPA(2002: ated that they were not able to identi an unambiguous difference n CO, emissions between conventional fuel and biodiesel. exhaust 10 percent increase in the tailpipe Other research suggests that there is a emissions of CO, when using biodiesel, but that the sequestration effect the plans to start with is calculated to offset this increase.