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California environmental regulators have approved an update to the state’s long-term greenhouse-gas emissions plan that calls on the trucking industry to transition from diesel to mostly electric and hydrogen-powered vehicles by 2050.

WASHINGTON — Fleet executives told a National Research Council committee of their efforts to save on fuel consumption and what they would recommend to federal agencies that are writing the next rule on greenhouse-gas emissions.

The price of U.S. retail diesel rose by 0.4 cent to $3.975 a gallon, the second consecutive weekly increase after a five-week decline, the Department of Energy reported.

The California Air Quality Resources Board voted April 25 to extend the deadline for independent truckers and small fleets to comply with new state emissions rules.

New Hampshire lawmakers voted to raise the state’s 19.625-cent fuel tax by 4 cents starting July 1.

California regulators are considering relaxing strict rules for smaller trucking fleets to clean up older diesel-powered trucks that are among the state’s worst remaining sources of air pollution, the Los Angeles Times reported.

A group of more than 20 environmental, health and trucking industry stakeholders have asked House committees to continue funding a popular diesel emissions reduction grant program omitted from the Obama administration’s 2015 fiscal year budget.

Federal regulators should develop a separate standard for natural gas-powered vehicles when they finalize the second phase of the government’s emissions reduction and fuel-efficiency standards for medium- and heavy-duty trucks, according to a new report by the National Research Council of the National Academy of Sciences.