Aims and policies The Students' Union aims to "advance the education of Students" by "representing the students of the University locally and nationally, organising services and activities to meet their needs" and "taking positive measures to encourage and build a student community which respects and celebrates the diversity of its membership". The Students' Union, its officers and staff are bound by democratically chosen policies and are reviewed every three years (unless circumstances warrant a more frequent review). Education policies The Students' Union campaigns for the abolition of all tuition fees, introduction of financial support for postgraduate students, reinstatement of public investment in education as a social good, and against cuts to education. Environmental and ethical policies The Students' Union maintains an environmental policy, undertaking the Students' Union to: educate its members on the issue of climate change, implement an Environment Code of Best Practice, call on the university to reduce its environmental footprint, lobby local authorities to work towards a sustainable Sheffield. Nestlé products are banned within the Students' Union and its commercial services and the Students' Union has no dealings with the company due to its "unfair exploitation of third world countries". As the result of a referendum in 2012, the Students' Union has introduced a 'strong anti-arms trade policy', and has consistently lobbied the university since to divest itself of any involvement with the international arms trade. In a referendum in 2011, students of Sheffield Students' Union approved a policy to stop selling bottled water and replace it with a series of free drinking fountains and affordable, re-usable bottles. The bottled water ban was upheld following a referendum in October 2014, and will remain in place until 2017. The Students' Union council gave its support to the Go Fossil Free campaign by passing a motion in spring 2014. This global divestment movement, initiated by 350.org, encourages investors to remove their financial support for companies involved in the extraction and combustion of fossil fuels; activities which must be stopped in order to limit anthropogenic global warming. Representative policies The Students' Union has LGBT friendly policy, ensuring that all activities, facilities, services, organisations and events are LGBT friendly. Policies pertaining to the Israeli–Palestinian conflict The University of Sheffield Students' Union has two policies relating to the Israeli–Palestinian conflict, entitled "End Israeli Occupation" and "Twinning with the Islamic University of Gaza". The Students' Union, according to these policies, lobbies the university