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One year after more than 1,200 people were arrested in front of the White House during two weeks of sit-ins against the Keystone XL tar sands oil pipeline, a coalition of Texas landowners and activists will attempt to physically halt its construction. Led by veteran climate justice organizers, participants ranging from environmentalists to Tea Partiers are preparing to lock arms for a sustained nonviolent civil disobedience campaign, beginning perhaps as early as this week.

The impetus for such action, which is being called the Tar Sands Blockade, goes back much further than last summer, however. In 2008 and 2009, small landowners along the pipeline’s route in rural Texas, Oklahoma and Nebraska started noticing survey stakes with orange tape marked “KXL.” They soon found out that TransCanada – the company building the pipeline – had eminent domain power over their property and that if they didn’t sign a contract allowing TransCanada to build, they would be taken to court.