The Oklahoma Chapter of the Sierra Club hosts a lawful, peaceful protest and walk against tar sands pipelines, including the Keystone XL. Speakers include: Kate Althoff: Arkansas environmental leader to speak about Mayflower spill. Earl Hatley: Local environmental leader whose environmental activism started with Tar Creek. Gwen Ingram: Local environmental leader whose environmental activism started with fighting nuclear energy in Oklahoma. Barbara VanHanken: Local environmental leader and State Executive Committee Member for the Oklahoma Chapter of the Sierra Club.