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A group including motor carriers, businesses, several members of Congress and a conservative public interest legal foundation has filed a lawsuit in federal appeals court challenging the U.S. Environmental Protection Agency’s finding that greenhouse gas emissions are a danger to public health.

Diesel prices slipped for the fifth week in a row, dropping 1.3 cents to a national average of $2.756 a gallon, the U.S. Department of Energy said in its weekly fuel report.

A new economic index based on diesel fuel purchasing in the trucking industry fell in January after an increase in December, the index’s authors said.

A group including motor carriers, businesses, several members of Congress and a conservative public interest legal foundation has filed a lawsuit in federal appeals court challenging the U.S. Environmental Protection Agency’s formal finding that greenhouse gas emissions are a danger to public health.

The federal government in the Washington area remained closed for a fourth day Thursday following Wednesday’s blizzard and as a result the Department of Energy is not likely to release its weekly fuel prices until at least Friday.

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 California Air Resources Board has launched a $20 million funding assistance program designed to stimulate the purchase of hybrid trucks and buses that reduce diesel emissions.

UPS Inc. said it benefited from a sharp increase in December air shipments out of Asia and a busy holiday season to post profits for the fourth quarter and the full year.