Stockholm Environment Institute (SEI) is an independent, international research institute founded in 1989. Its mission is to support decision-making and induce change towards sustainable development around the world by providing integrative knowledge that bridges science and policy in the field of environment and development. SEI was ranked as the world’s top think tank on environmental policy issues in the 2020 Global Go To Think Tanks Index compiled by the University of Pennsylvania's Think Tanks and Civil Societies Program. SEI has around 320 employees working at research centers in seven countries around the world. SEI’s headquarters are located in Stockholm, Sweden. Additional SEI research centres are located in Kenya (SEI Africa) Estonia (SEI Tallinn); United Kingdom (SEI York and SEI Oxford); the United States (SEI US); Thailand (SEI Asia); and Colombia (SEI Latin America).