None were particularly new or original. Long before white settlers arrived — and still to this day — Indigenous people kept ...

This is the first in a monthly series highlighting Arizona climate leaders and answering readers' climate-related questions.

Advanced Water Purification rules will help cities all over Arizona create a new, safe and reliable source of drinking water.

“But they had decided to call it the Five C's.” Today, when people think about Arizona and climate, their mind might go to ...

climate might also be the “C” that has changed most in the 113 years since Arizona became a state — and the one that has brought the most change. The America of the late 1800s was a country ...