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LOUISVILLE, Ky. — Truck and engine makers’ work on selective catalytic reduction technology has convinced the U.S. Environmental Protection Agency to abandon its “historical hesitancy” on that approach to emissions control.

As I write this in early March, the U.S. Department of Energy reports that the price of diesel fuel in the United States is $2.045 per gallon. After hitting a record high of $4.764 on July 14, the price of diesel has fallen by $2.719.

Forget about getting truck drivers to remove snow and ice from trailer rooftops. For one, many drivers cannot even walk across the parking lot, let alone be expected to somehow get on top of a trailer roof.

ORLANDO, Fla. — The Truckload Carriers Association has decided for the first time to support a fuel tax increase as a preferred method of highway funding.

The U.S. retail diesel fuel average dropped 4.2 cents last week to $2.045 a gallon, as the price in the Midwest fell below $2, the first time that has occurred anywhere in more than four years, the Department of Energy reported.

The U.S. Environmental Protection Agency last week took the first step toward creating a national cap-and-trade system, proposing a new rule that would establish a federal system for reporting carbon dioxide emissions and other greenhouse gases produced by large stationary and mobile sources.

In its continued attack on greenhouse gas emissions, the California Air Resources Board recently proposed a rule cutting the “carbon intensity” of transportation fuels.

The Energy Department lowered its projection for diesel prices from a previous forecast and said it is possible that trucking’s main fuel will fall below gasoline in price this summer.