Birds come north in the spring to feed on the explosion of insects and plant life that takes place during North American summers. But a warming planet is changing what we see at our bird feeders and in our forests.
Allegheny County isn’t as green as it used to be. In the last five years, 11,044 acres of trees were lost. The nonprofit Tree Pittsburgh is trying to figure out why.
This "underdog" of aquatic animals can filter up to 600 gallons of water per month. Working together, mussels can dramatically clean the rivers where they live. Now, Philadelphia is banking on just that.
If you want to impress your friends on your next hike through the woods, there's a guy at Raccoon Creek State Park that can make you a guru of spring wildflower identification.
People who study birds are now using radar to make maps that can forecast migration at night. They say these maps could help by reducing the number of birds that collide with buildings and wind turbines.
