It is considering designating millions of US-owned acres as a permanent conservation system.
Anthropologist Brian Fagan uses Earth’s distant past to predict the crises that may lie in its future.
Arizona law requires employers to use federal database to determine employee eligibility.
State and local governments tighten belts as tax revenues fall, a ripple effect of the housing slump.
It's a 50 percent possibility, a new Scripps study finds, which would squeeze water supplies in Arizona, California, Nevada, and New Mexico.
Lives change. That's why she keeps her address book in pencil.