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The trucking industry reaffirmed its support of national fuel efficiency and greenhouse gas emission standards for heavy- and medium-duty trucks while testifying in Chicago Monday at the first of two federal public hearings on the subject.

American Trucking Associations said Friday it has adopted a carbon-emissions control policy supporting a national fuel-economy standard for trucks, rather than government actions to increase fuel prices or alternative-fuel mandates.

A coalition of industry groups, including American Trucking Associations, touted its own voluntary efforts toward improving environmental sustainability as part of its push toward what it called “responsible” energy policies.

A truck replacement program designed to cut diesel emissions has been included as part of a legal settlement between the South Carolina State Ports Authority and an environmental group over expansion at the Port of Charleston.

The U.S. Environmental Protection Agency, noting “growing interest” in alternative-fuel conversion systems, recently proposed to streamline certification of aftermarket conversions that turn Class 8 diesel engines into engines that can burn diesel and natural gas.

The California Air Resources Board has awarded $200 million in Proposition 1B funds to help cut emissions from heavy-duty trucks and other sources in the state’s four busiest trade corridors.

A new study has found that nationwide adoption of a low-carbon fuel standard would increase the retail cost of motor fuel by as much as 170% over a 10-year period.

The National Highway Traffic Safety Administration plans to propose fuel efficiency standards starting with model year 2016 commercial medium- and heavy-duty on-highway vehicles, and said it will prepare and environmental impact statements as part of the procedure.