The 20th International Forum on Weather and Climate in Paris (France) was enriched this year by the International Colloquium "How can we talk about our future transformations?". This title may suggest that the transformations we need to make now are already scientifically defined and even quantified. Then, the remaining questions brought to light by the invited speakers focus on how “to build intergenerational stories” to accelerate “new collective narratives”. However, the awarding of the 2021 Nobel Prize in Physics highlights the complexity of weather and climate dynamics, and in particular their highly intermittent nature. Therefore, the most pressing question seems to be whether the ‘Extreme Variability, Scales and Complexity’ have been properly incorporated when defining transformations to be undertaken. This presentation will benefit from a multidisciplinary scientific and technical contribution geared by the HM&Co lab of the Ecole des Ponts ParisTech (hmco.enpc.fr) towards the sustainable, desirable and resilient city. We will shortly recall the deepening of the Universal Multifractal (UM) concepts, linked to several initiatives launched in recent years to better incorporate the heterogeneity/intermittency into public policy practices. Numerous instrumentation and modeling experiments related to the impacts of climate change have been carried out. Considering the complex, dynamic interactions between geophysical and anthropogenic fields within a conurbation such as the Ile de France region, a transition towards the shared value economy has been considered to best stimulate sober and collaborative development. To encourage such transitions, three examples will be given on the impacts of heterogeneity/intermittency on: (i) the definition of environmental indicators for our cities - considered as a multimodal and multifunctional structure – and on their environmental characteristics (thermal comfort, visual, quality air, attenuation of heat islands, etc.), (ii) the monetization of the amenities provided by blue-green solutions in urban areas and their socio-economic contextualization at large-scale, and (iii) a new form of the multifractal environmental balance assessment.