intensive ones); Better sizing (avoiding oversized services and waste); Sharing (optimising the use of each energy/resource-based service). The sufficiency theory also overlaps with the concept of 'consumption corridors'. This concept emerged notably from a transdisciplinary research program funded by the German Min­istry for Education and Research, entitled “From Knowledge to Action – New Paths towards Sustainable Consumption.” Consumption corridors define a space between what is socially enough (the floor) and environmentally not too much (the ceiling). Concrete sufficiency actions There are many examples of individual and collective actions and changes that fall under the sufficiency approach. The following (non-exhaustive) list provides some: Living and working in smaller (or shared) spaces; Moderating internal temperatures in buildings; Using more natural rather than artificial light; Choosing smaller appliances (or at least commensurate to actual needs); Owning and using less (often) appliances and electronic products; Sharing equipment between businesses; Flying less; Favouring low-energy transport modes (walking, cycling…); Sharing vehicles; Promoting remote work and flextime; Prolonging the lifetime of products through repairing, re-using, and fighting obsolescence; Refraining from fast fashion; Favouring local low-techs over high-techs; Switching to vegan and vegetarian diets; Buying locally-produced food; Avoiding food waste. Sufficiency drivers and policies One of the main barriers to sufficiency, often put forward by sceptics, is the dominant social paradigm in liberal societies, which currently values material possession, greed, power, individualism, social differentiation through consumption, and other mindsets that conflict with the mentalities that sufficiency requires (temperance, moderation, downsizing, etc.). However, as environmental concerns grow, there are also signs showing the potential beginning of sufficiency trends. Three examples are: The growth of cycling for daily trips in an increasing number of cities worldwide; The "flight shame" movement in Sweden; The reduction of average meat consumption in some countries (e.g. France). The role of intentionality in sufficiency is debated. While for many authors sufficiency requires (as a starting point) a profound and voluntary reassessment of personal and collective priorities in light of the Earth’s limits, for others, audiences could be ‘nudged’ or persuaded into taking some sufficiency actions without either being engaged with the issue or being primarily motivated by environmental concerns. There appear to be many co-benefits to sufficiency actions that could encourage their uptake, e.g. health and animal welfare for vegetarian diets, air pollution reduction for driving less, children’s health for limiting screen use, biodiversity protection for limiting artificial lights, etc. There is increasing research into