Students at three major American universities are digging in for a series of prolonged sit-ins and risking suspension and arrest to demand that their schools divest from fossil fuels.NYU\u0026#039;s protest, which launched Monday, saw students with NYU Divest occupying the administrative elevator and lobby of the school\u0026#039;s Bobst Library to demand the Board of Trustees holds a vote on divestment at its next meeting and allows the group to give them a presentation.Protests began at Columbia University and the University of Massachusetts-Amherst last week as students demanded their administrations dump \u0022support of global climate disaster, exploitation, and human suffering.\u0022All three occupations continued on Tuesday as students spent the night in administrative buildings, even as Columbia officials threatened to suspend the seven remaining protesters occupying Low Library.\u0022I am sitting in because I see climate justice as a human rights issue,\u0022 Nikita Perumal, an organizer with Columbia Divest for Climate Justice (CDCJ), told Salon. \u0022It is immoral that Columbia actively profits from an industry that threatens the well-being of vulnerable communities around the world.\u0022Other organizers said they would not leave until Columbia\u0026#039;s president Lee Bollinger agrees to recommend to the Board of Trustees that the school divest its $9.2 billion endowment from the top 200 publicly-traded fossil fuel companies.\u0022Suspension threats are the administration\u0026#039;s way of bullying us out of Low Library,\u0022 CDCJ organizer Lucas Zeppetello, who is participating in the sit-in, said Monday. \u0022They seek to drain our morale and demoralize the group. This strategy has failed largely due to the support we have received from on campus groups dedicated to peaceful protest.\u0022In fact, more than 60 professors, staff, and other faculty members from Columbia and Barnard (the woman\u0026#039;s liberal arts college affiliated with Columbia) published a letter of support for the students on Monday, calling on Bollinger to \u0022directly and immediately\u0022 engage with the protesters.The letter continues:[W]e consider suspension and expulsion disproportionately severe punishments for a nonviolent act of civil disobedience. With its rich legacy of student activism, Columbia claims to value and promote free speech; it would be a violation of these beliefs to suspend or expel students simply for seeking action frome consider suspension and expulsion disproportionately severe punishments for a nonviolent act of civil disobedience. With its rich legacy of student activism, Columbia claims to value and promote free speech; it would be a violation of these beliefs to suspend or expel students simply for seeking action from their administration.\u0026nbsp; their administration.Iliana Salazar-Dodge, another CDCJ organizer, told Salon that the risk of suspension \u0022is minor in comparison to the danger that people are facing when they confront the fossil fuel industry and private interests around the globe.\u0022\u0022I am willing to take this stand because climate change is affecting so many people, especially communities of color, and it is hypocritical for Columbia to invest in companies that profit off of destruction and death,\u0022 she said.Meanwhile, Democratic presidential candidate Bernie Sanders, also in town this week Tuesday\u0026#039;s New York primary, expressed his support for the action on Twitter, writing, \u0022Let us stand in solidarity with the students at Columbia and NYU for demanding their schools divest from fossil fuels\u0022 and adding the hashtag #KeepItInTheGround, which has become a rallying cry of the climate movement.In Amherst, 34 students calling for divestment were arrested last week on the fifth day of their sit-in. Despite that, they have vowed to\u0026nbsp;resume their protest on Tuesday.Across the world, students at a handful of Australian universities held similar actions—including one that could be described as \u0022cheeky\u0022—calling on their school administrations to drop investments in fossil fuels.