Existing technologies are already very powerful to help us reducing our environmental footprint, especially in cities. However some details must be carefully watched out: - Full cloud is a dead end: for latency, cost and operational reasons, edge computing is not an option. - Of course, cloud is still required for some data and KPI. Make sure you don’t take unnecessary risks with the overlap between Cloud Act and GDPR. Chose sovereign clouds, and protect yourself from your cloud vendor: although their services could look cheap in first hand, once their platforms are dominant, prices will increase by far (see google maps : x14 in july 2018) - When looking for long term viable solutions, better to rely on worldwide standards: LTE-M is the only solution than guarantees Quality of Service, and cost reduction thanks to scale effect and worldwide distribution. Last but not least, it is available today at affordable cost (1€/year/device in Germany) - Mutualization of assets is longer term, will be made possible thanks to the development of autonomous machines, and will authorize complex, multidimensional, conditional optimizations for the most efficient urban experience. - It will reactivate the need for holistic cockpits far from last decade’s projects which were based on fully integrated hypervision systems. They will work as one of several federative urban apps. - But IoT will also power the citizen in the city, creating the risk of disrupting both utilities and cities. Only careful ecosystems management will release all energies to move to a sustainable world.