In an August 1 letter signed by more than 100 businesses and industry groups, stakeholders urged the Environmental Protection Agency to act quickly to address a court decision to vacate a 2011 rule that exempted biomass sources from greenhouse gas permitting requirements. The U.S. Court of Appeals for the District of Columbia Circuit ruled in mid-July that the agency did not have enough scientific evidence to exempt biomass sources. The groups, which included the American Forest and Paper Association and the American Farm Bureau Federation, said inaction by the agency could lead to significant uncertainty for the industry.