At a meeting on Tuesday, Elon Musk laid out his plan to colonise Mars, but it was during the Q&A session that a woman raised one of the most important questions: who will be picked to embark on a perilous journey to colonise a harsh planet?

Two key reasons why smart cities are getting so much attention are the rise of societal concerns linked with increased urbanisation and the growing need to decrease public budgets. Between 2018 and 2030, the number of cities