During the coldest days of winter, an "Earth Train" departed from St. Paul, carrying dozens of artists, activists and regular folks from Minnesota to Washington, DC. On board were KFAI producers Barbara Jean Meyers and Melissa Koch. Along the way they interviewed passengers including Kevin Kling, Louise Erdrich, Prudence Johnson and others, about why they were making the journey. Many were inspired by Bill McKibben, co-founder of 350.org, who believes that the Keystone XL pipeline wound be the final nail in the coffin for planet Earth. On February 17, advocates gathered at the nation's Capitol for Forward on Climate to protest Keystone and draw attention to global warming. Nearly 50,000 people assembled to promote environmental stewardship, making it the largest rally on climate change in U.S. history. "Tipping the Scale" is an audio documentary that chronicles this historic event.