Karen Higgins, co-president of NNU, said, "A real finance tax would generate $350 billion a year in the U.S. alone and bring relief to families out of homes, friends out of work, patients out of care, communities running out of time. The tax starts a revenue flow back to the 99 percent." Noting the growing union support, an article in the progressive-leaning "Mother Jones" magazine said that union support could splinter and derail the protests rather than sustain them because while unions are tightly organized, hierarchical, and run with a clear chain of command, Occupy Wall Street is the opposite in that they are "a horizontal, autonomous, leaderless, modified-consensus-based system with roots in anarchist thought." However, the article went on to suggest that if the unions and OWS joined together they could work to create a progressive movement that "effectively taps into the rising feeling among many Americans that economic opportunity has been squashed by corporate greed and the influence of the very rich in politics." As the success of the movement has become apparent, union organizers have begun to embrace some of their social media skills, bold tactics, and the simplicity of the 99% slogan. Damon Silvers, the AFL–CIO's policy director, said, "We think the Occupy movement has given voice to something very basic about what's going on in our country right now. The fact that they've figured out certain concepts and language for doing that, we think is really important and positive." The International Union, United Automobile, Aerospace and Agricultural Implement Workers of America (UAW) has endorsed the movement saying, "We recognize the need to work together and learn from each other. The vitality, energy and dialogue growing from the Occupy Wall Street movement show the potential to organize, build power and win justice for the middle class." Several environmentalist leaders supported Occupy Wall Street. In 2011, Greenpeace Executive Director Phil Radford expressed Occupy Wall Street, stating:: "We stand – as individuals and an organization – with Occupiers of all walks of life who peacefully stand up for a just, democratic, green and peaceful future." Bill McKibben of 350.org stated: "The reason that it's so great that we're occupying Wall Street is because Wall Street has been occupying the atmosphere." Sarah Hodgdon of the Sierra Club stated: "Many Sierra Club staff and volunteer leaders have participated in and/or lent support to these demonstrations standing up for the end to corporate greed. The demands and values of the protesters are very much in line with Sierra Club's strategic priority of confronting the power of the coal and oil industries."