By Jeremy Hance In March 1995, a few wolves cautiously exited their pens into the melting snow of Yellowstone National Park, ...

Hundreds of years ago, Poh said the sounds of different bird species’ voices would loudly fill the air. Though he shared his passion for science, on a more personal note, he added, “It is sad to visit ...

In the 1970s, acid rain was one of the most serious environmental threats in North America and Europe. The air was so laden ...