Sustainable development is successful only when it improves people's well-being without degrading the environment.
“Development” is shorthand for committing to well-being for all. “Sustainable” implies that such development must occur within what the planet’s ecosystems are able to replenish, year after year. We need to secure people’s well-being within the means of nature. This is how UNEP, WWF, and IUCN stipulated the conditions for sustainable development in their landmark report “Caring for the Earth.”
One simple way to assess sustainable development’s two dimensions is by using the Ecological Footprint and Human Development Index (HDI) (Boutaud 2002). Because both these indicators apply to various geographic scales (globe, region, country, community), this framework can be used to track sustainable development progress at any scale.
The United Nations considers an HDI greater than 0.8 to be “very high,” and 0.7 as “high” human development. Universally replicable well-being requires an average Ecological Footprint less than world-average biocapacity. At humanity’s current population, there are 1.6 global hectares of biologically productive area per person on Earth. Given growing populations and recognizing wild species’ needs for biocapacity, the average Ecological Footprint per person worldwide needs to fall significantly below this threshold. One such point of view is (late) E.O. Wilson’s suggestion for using just half of Earth’s resources in order to secure 85% of the world’s biodiversity (Wilson 2016).
This reasoning is also applicable to businesses, as explained in the visual e-book produced with Schneider Electric. It argues one-planet prosperity is becoming essential for successful business strategies. This is also emphasized in our Earth Overshoot Day 2022 theme on circular businesses.
Kate Raworth has playfully pushed this thinking, advocating for a “safe and just operating space.” She depicts the sustainable development challenge as a two-dimensional doughnut, the inner edge representing the minimal social foundation and the outer edge of the doughnut the upper ecological ceiling (Raworth 2017). Therefore, the “flesh” of the doughnut corresponds to the “safe and just operating space,” the same space depicted as the blue “global sustainable development” box in the lower right corner of the HDI-Footprint diagram. The clever and catchy depiction of a doughnut inspired her to promote this approach as “doughnut economics,” an economic theory with the purpose of supporting human wellbeing within the constraints of our planet.