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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.

Gov. Jay Inslee wants Washington state lawmakers to adopt a more aggressive course for curbing greenhouse gas emissions — one that better aligns with the latest science.

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.

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

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.

In Hillsboro, Oregon, SolarWorld is hiring back workers and planning to ramp up its production with news of a 30 percent tariff on imported solar panels.

The Trump administration announced a new plan last week that would allow offshore oil and gas drilling in the ocean off the West Coast for the first time since 1984