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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.

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

The threats to Puget Sound's orcas will pose many tests to our ability to respond, starting with the Legislature. 

A look back at what happened locally and nationally the past 12 months — with a twist.

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.

A chimpanzee sanctuary near Cle Elum offers shelter to apes formerly confined to research labs.

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

We know the problem: The whales are starving. We've tried just about everything to address that — except the one thing we really need to do.