Scenarios have an explorative character: they describe a range of alternative plausible futures – future situations that may happen. Exploratory scenarios work from the basic understanding that it is not possible, in complex systems under uncertain futures, to predict the most likely future. Instead, with multiple scenarios one can explore the ‘what if’ question: what happens to our plans and strategies under very different assumptions about future trends like climate change, energy transition, demography, lifestyle and technology – creating completely different, challenging scenarios? Explorations of plausible futures can be based on different data sources.