“The People’s Climate March” has received worldwide attention to kick off Climate Week in New York and an ad in the New York Times is asking if President Obama is his own worst enemy when it comes to climate. The ad tells the president that if his administration accepts the Environmental Protection Agency’s proposal to alter the Renewable Fuel Standard (RFS) he “will have inadvertently done more to damage [his] climate legacy than [his] worst enemies.”

The ad warns that the proposal would let oil companies off the hook for blocking competition from American renewable fuels, and prompt an exodus of investment in cellulosic ethanol—the world’s cleanest motor fuel—to China and Brazil.

In the ad, the Advanced Ethanol Council and Biotechnology Industry Organization caution President Obama that investments in additional cellulosic production beyond these four plants will likely shift overseas if the President adopts the flawed methodology of the EPA proposal, regardless of whether he decides to actually raise the renewable fuel targets in the rule. This month, two commercial scale cellulosic ethanol biorefineries came online in Iowa and Abengoa will be hosting a grand opening for its cellulosic ethanol plant in Kansas in October.