on more than 300 college campuses, from middlebury in vermont to berkeley in california, students are calling on their schools to divest. sometimes they are rebuffed, as happened recently at harvard, which at over $32 billion dollars has the largest university endowment in the country. last fall, the school's president said divestiture was neither, "warranted or wise." but this month, nearly 100 faculty members sided with the students. they said, our university invests in the fossil fuel industry. we now know that fossil fuels cause climate change of unprecedented destructive potential. divestment has worked once before, and in a big way. three decades ago, students, religious communities, and unions sustained a campaign against u.s. companies doing business with south africa and helped put an end to apartheid. only four months after his release from prison, nelson mandela came to california to say thank you to americans who kept up the economic pressure. with me now are two people who are leaders of this new divestment movement. ellen dorsey is executive director of the wallace globa