Ecology

Margaret Sun / 90.5 WESA

Next to steel and Super Bowl championships, Pittsburgh is synonymous with three rivers. In the summer, the Three Rivers Arts Festival dominates downtown and the moniker is part of a number of companies in the region -- not to mention there used to be a stadium that bore the name.

But does the city technically have three distinct rivers?

Sarah Schneider / 90.5 WESA News

In an urban forest, trees don’t just provide aesthetics, they prevent river overflow and filter pollution.

Since the early 2000’s, tens of millions of North American ash trees have been killed from a non-native insect, the emerald ash borer, that arrived via shipping pallets in Michigan. The eastern Asia beetle has killed thousands of Pennsylvania trees and nearly 50 in Pittsburgh’s Riverview Park.