I am delighted that the EPA has finally moved to abate the disastrous impacts of climate change by regulating carbon dioxide emissions from power plants. But, given the adverse reaction from the coal industry, the agency should have issued parallel regulations on emissions from meat industry operations.

A week full of new Environmental Protection Agency rules and environmental hearings in Arizona provided a campaign talking point for conservative candidates and a golden opportunity for others to appeal to the base of Arizona’s dominant political party.

Negotiators quietly forged 11th-hour net metering compromise

As it turned out, Arizona’s battle over solar net metering wasn’t what it seemed.

If generally accepted predictions of global warming come to pass, Arizona’s transportation system will have to adapt due to stronger dust storms, snowfall, flooding, forest fires and other factors, experts say.

The only two uranium mines operating in Arizona and an associated mill in southern Utah are set to cease operations temporarily as prices for the ore decline.

WASHINGTON – Arizona universities ranked among the top schools for the number of international students they had enrolled in the 2012-2013 academic year, a new report said.

Max Ashton is a senior at Brophy College Preparatory with a 4.0 grade point average. He is also blind.

WASHINGTON – Arizona is the 12th-most energy-efficient state in the nation this year, the same position the state held last year, according to rankings released Wednesday by the American Council for an Energy-Efficient Economy.

A uranium mining company that was sinking a shaft for a mine south of Grand Canyon National Park has put the work on hold, citing market conditions and the expense of litigation. Energy Fuels Resources Inc. said the operation will ...

SAN DIEGO (AP) ai??i?? Border Patrol agents will be allowed to continue using deadly force against rock-throwers, the chief of the agency said, despite the recommendation of a government-commissioned review to end the practice.