The world's population is growing, and energy use and environmental pollution are on the increase. At the same time, natural resources and raw materials are becoming scarce and the effects of climate change are warning us that we need to reduce our output of greenhouse gases. Scientists in the Field of Expertise Sustainable Systems at TU Graz are focussing on these complex challenges and undertaking interdisciplinary research to find sustainable solutions. Research topics range from sustainable urban planning, innovative building technologies and energy systems to the use of renewable energy sources, intelligent energy networks and green mobility.