Pollution is a problem that concerns citizens throughout Europe’s urban areas. Citizens are becoming more and more alarmed by and concerned with pollution and its effects on our health. They are seeking answers for how we can live sustainably without sacrificing our high quality of life or our health. It is clear that we will need to manage a transformational process which leads us to less pollution and less energy consumption whilst increasing the quality of public space available for citizens. E4-share argues that this transformational challenge can be met with flexible car-sharing systems, using electric cars which allow citizens to efficiently utilise and change between different modes of transport. E4-share will lay the foundations for electric car-sharing systems that are not only efficient but also economically viable; it shall achieve this aim by studying and solving the optimisation problems that come up when designing and operating car-sharing systems.