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Senate Democrats expect to pass an unemployment benefits bill soon that includes a provision retroactively reinstating a biodiesel tax credit through the end of the year, according to a spokeswoman for Sen. Harry Reid (D-Nev.).

While U.S. Environmental Protection Agency Administrator Lisa Jackson indicated last week that her agency was moving forward with plans to regulate greenhouse gas emissions, opposition to a Senate cap-and-trade bill seemed to be gaining enough momentum to block its passage.

The Environmental Protection Agency has not yet said how it intends to require heavy trucks to curb greenhouse gas emissions, but a report on the agency’s Web site projects that an advanced notice of rulemaking could be posted as early as June.

Forward Air Corp. said its fourth-quarter profit fell to $6.4 million, or 22 cents per share, from $8.3 million, or 29 cents, a year ago.

The U.S. retail diesel average dropped 5.2 cents to $2.781 a gallon last week, the third straight weekly drop, the Department of Energy reported.

Knight Transportation has placed an order for 370 2010 model Volvo VN trucks with selective catalytic reduction technology, Volvo Trucks North America said Monday.

California environmental regulators are considering several options to delay some requirements of the state’s diesel emissions regulation to provide “short-term relief” for truckers feeling the effects of the recession.

Aggressive fuel economy research and development funded by the federal government will reduce fuel consumption of long-haul trucks by 30%, Energy Secretary Steven Chu told a Senate committee Thursday.