The herbicide glyphosate, found in products such as Roundup, has become a crucial tool on midwestern farms—but weeds are becoming resistant.
As the last coal-fired power plant plans to shut down at the end of the year, the Navajo Tribe is embracing renewables.
California’s newly verdant hills will turn into kindling come this year’s wildfire season.
Trump Administration officials have pulled out of talks with California over fuel economy standards for cars.
Arizona, and seven other states that use the Colorado River for water, is putting together a plan to address future drought and water needs.