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WASHINGTON — The Environmental Protection Agency and the Obama administration as a whole will continue to emphasize their campaign against climate change from carbon emissions, even if all aspects of useful technologies are not known at present.

The national average price of diesel declined 1.1 cents to $2.832 per gallon, marking its sixth consecutive weekly decrease, the Department of Energy reported July 6.

The starting point for limiting diesel emissions can be traced to a provision in a bill reauthorizing and expanding the Clean Air Act of 1977 that was signed into law by President George H.W. Bush in 1990.

HOUSTON — BP will pay up to $18.7 billion in penalties to the U.S. government and five states to resolve nearly all claims from its deadly Gulf of Mexico oil spill five years ago in the largest corporate settlement in U.S. history.

The U.S. Environmental Protection Agency is aiming to put more ethanol in gasoline even as it reduced the consumption target established in a 2007 energy law, an EPA official said.

Diesel’s national average price declined 1.6 cents to $2.843 per gallon, the fifth consecutive decrease, the Department of Energy reported June 29.

The Obama administration didn’t adequately consider the billions of dollars in costs before issuing a rule designed to cut hazardous emissions from 460 coal-fired power plants, the U.S. Supreme Court ruled.

Retail gasoline prices are falling in the United States just in time for Americans to take to the roads in record numbers for the July 4 holiday.

The federal government has issued its long-awaited proposal to further tighten greenhouse-gas emissions from heavy- and medium-duty trucks, and for the first time regulate trailer efficiency.