The latest leak in the Keystone oil pipeline in North Dakota on Tuesday continues the troubled history of the 15-year-old pipeline. The 2,700-mile-long (4,350-kilometer-long) pipeline originates ...

(Richard Webb/Bugwood.org via AP) University of Delaware entomologist Doug Tallamy's research has identified “keystone” plant species that make up the foundation of many U.S. ecosystems by producing ...

University of Delaware entomologist Doug Tallamy's research has identified “keystone” plant species that make up the foundation of many U.S. ecosystems by producing food for native insects ...

FORT RANSOM, N.D. (AP) — Officials shut down Keystone oil pipeline in North Dakota after a rupture leads to the release of oil.

University of Delaware entomologist Doug Tallamy's research has identified “keystone” plant species that make up the foundation of many U.S. ecosystems by producing food for native insects, thus ...