Just in time for summer, the megalodon—the ancient, city bus-sized shark known as the “Megatooth”—has reared its ravenous snout. While the oceans are now safe from the Megatooth, which went extinct an ...

Arizona regulators have again killed rules that would require Tucson Electric Power and other state-regulated power companies to reach 100% carbon-free energy generation by 2070. The latest twist in ...