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The states join 26 others to argue the president's plan increases public health risks and violates the federal Clean Air Act.

100 years after the 19th Amendment granted women the vote, meet the Pacific Northwest activists who ignited the effort.

Study shows trees along the coast and in the Cascade and Olympic mountains have the most potential to sequester carbon.

After years of conservation efforts, surveys show depleted populations of groundfish are rebounding ahead of schedule.

In southeast Alaska, tribes on both sides of the border unite in opposition to a Canadian mine that threatens ancestral fish runs.

As more cities like Seattle ban plastic straws, Swedish-owned BillerudKorsnäs design lab has is developing a solution.

A lifelong visitor to the San Juan Islands reflects on the southern resident orcas, changing ecosystems and the passage of time.

In this 360 video, see how the Eagle Creek Fire changed the forest and its popular hiking trails.

To prevent large-scale wildfires, we'll need to allow some blazes to burn — and set others ourselves.

The lab has hangar space filled with miniature models based on dams across the country – including the Columbia and Snake rivers.