 Dear colleagues and partners, in 2014 SEI celebrated its 25th anniversary. For a quarter of a century SEI has been deeply involved in sustainable development agenda, always with a focus on finding solutions to the many pressing challenges facing people and society. We established a forerunner to the Intergovernmental Panel on Climate Change, IPCC, and our research introduced a two-degree climate goal. Our contributions to the Montreal Protocol and our pioneering work on energy transitions, sanitation and air pollution have brought about real change. Making an impact, providing rigorous science and solutions to drive sustainable outcomes, has always been at the heart of our work. And 2014 was no different. We have continued our tradition of responding to new challenges with innovative thinking and research. This report highlights aspects of our work in the past year that have helped us change minds and policy. Last year we also developed a new five-year strategy, which gives us the platform we need as an organisation to continue deliver results together with our many partners in an increasingly complex world. I'd like to take this opportunity thanking all my colleagues at SEI for their hard and dedicated work, all our partners, and all those supporting SEI financially. Welcome to the 2014 annual report.