The art installation "Momentum" fills Pittsburgh Botanic Garden with color, sound and motion, inviting visitors to reflect on their bond with nature.

Environmental groups are divided on whether to support a new state board that would expedite the siting of electricity ...

One tip: walk in the center of the trail. Ticks like to attach themselves to long grasses. No need to use DEET.

Environmental groups want Nippon to clean up U.S. Steel's Mon Valley plants, which have racked up $64 million in fines and settlements in recent years.