The Norwegian Veterinary Institute begins building a trap at Seida to sort out invasive pink salmon migrating up the Tana River.

Alaska experts are grappling with the challenge of controlling the highly invasive Japanese knotweed, which is resistant to conventional eradication methods and threatens local ecosystems.

A "weed smackdown" at an Anchorage park is part of a long-running campaign to stop the spread of plants that are harming the natural ecosystem.

A volunteer program in Saanich, B.C., is helping to beat back invasive species on the island.

The Swedish Environmental Protection Agency and Agency for Marine and Water Management want to create a national list of invasive species, and have presented ...