By Amy Harder, The Wall Street Journal.

A former White House economic adviser is calling for changes to a 2005 law mandating increased use of alternative fuels in the nation’s transportation supply, adding a key voice to a growing chorus of people who say the policy is not working.

In a report published Thursday, Harvard University professor Jim Stock, who served on President Barack Obama’s Council of Economic Advisers in 2013 and 2014, proposes several reforms to the biofuels mandate, known as the renewable fuel standard, including some requiring congressional approval.