Sustainability

Groups to feds: Tighten mining rules in light of river spill

Citing the release of millions of gallons of toxic wastewater into a southwestern Colorado river earlier this month, a coalition of conservation groups, two Arizona Native American tribes and two county governments petitioned federal agencies Tuesday to tighten mining regulation on public lands.

Arizona environmentalists cheer EPA Clean Power Plan, utilities wary

WASHINGTON - Arizona environmental groups cheered the final version of the Clean Power Plan unveiled Monday by the Environmental Protection Agency, a first-ever national standard that aims to cut power plant carbon emissions by a third by 2030.