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The Environmental Protection Agency concluded Monday that greenhouse gases threaten public health and the environment, a move that allows the agency to regulate emissions of the gases.

As customers seek ways to cut expenses and reduce their carbon footprint through the supply chain, warehouse operators are taking their own steps to trim energy use, optimize loads and automate processes.

The average price of U.S. retail dipped 1.2 cents to $2.775 a gallon last week, the fourth straight decline. The fuel, however, remains just 3.3 cents below the high for the year, the Department of Energy reported.

Air and freight forwarder UTi Worldwide reported a decline in net income and revenue for its fiscal third quarter.

The Long Beach, Calif., attorney’s office has rejected an appeal by the Natural Resources Defense Council of a clean trucks lawsuit settlement between the Port of Long Beach and American Trucking Associations.

The Federal Railroad Administration said the fuel efficiency of the freight-rail industry rose 22% between 1990 and 2006, and that when compared to trucks in similar routes and distances, is between 1.9 and 5.5 times more fuel efficient.

The Surface Transportation Board has approved an application by 10 small drayage carriers serving the ports of Los Angeles and Long Beach, Calif., to pool some of their operations and purchases of fuel, equipment and materials.

Navistar Inc., which said it has spent $600 million to develop its 2010 exhaust gas recirculation engine, said the company is losing sales of next year’s model because federal regulators “helped create the false impression” among customers that only urea-based after-treatment systems would meet 2010 federal emissions standards.

WASHINGTON — Several lawmakers, Department of Transportation officials and experts have  expressed concern with elements of a vehicle miles traveled tax, which some advocates tout as a replacement for the fuel tax. They also cautioned that a transition to VMT could be a slow process.