In the context of the sanitary crisis, it is digital technology that allows us to maintain links and activity during containment, and it is also what will enable us to win the fight against climate change. This video, co-directed by Ademe, the Pôle FibresEnergivie and the Smart Buildings Alliance, aims to show how it serves the city of tomorrow, which we want to be frugal, sustainable and united. It has been supplemented on June 10, 2020 by a webinar that addressed this subject in much greater detail.