Keystone XL Pipeline

Northwest lawmakers voted along party lines as the U.S. Senate voted Tuesday to reject a plan to approve the Keystone XL oil pipeline.

Fourteen Democrats voted with all 45 Republicans in the Senate to approve it, but the plan was one vote shy of the minimum needed to send the measure to the president. 

Steve Liptay Photo

This Saturday, environmental activist and author Bill McKibben will lead a rally against fossil fuel exports and the Keystone XL pipeline in Seattle. 

Known as one of the first voices to warn of the dangers of global warming, McKibben is on tour with his new book, Oil and Honey. He is also the founder of an international organization called 350.org, which he created to fight climate change. 

McKibben says 350 is "the most important number in the world, but nobody knew it until 2008, when Jim Hansen and his team at NASA published a paper saying we now know enough about carbon to know how much in the atmosphere is too much."