Land Sealing: Why Every Hectare of Soil Matters
Urban expansion permanently transforms soils, threatening biodiversity, agriculture and resilience to climate change.
Retail parks, housing developments, warehouses and roads: in France, an area equivalent to tens of thousands of football pitches disappears under impermeable surfaces each year.
The conversion of living soil into an impermeable surface, or one lastingly altered by construction. The process is almost irreversible.
What is lost beneath concrete
Sealed soil stops providing the services it once delivered unnoticed: absorbing rainwater and limiting floods, storing carbon, supporting biodiversity and producing food. Urban sprawl also fragments natural habitats and lengthens daily journeys, adding further emissions.
The sprawl paradox
Land take often grows faster than the population. Space is consumed not to house more people, but to spread development farther out.
Low-density housing, peripheral business parks and oversized retail areas reflect a planning model inherited from the era of cheap car travel and now increasingly challenged.
Building the city on the city
France has set a target of "zero net land take" by 2050. In practice, this means intelligent densification, redevelopment of industrial and commercial brownfield sites, building upwards rather than outwards, and restoring nature wherever possible.
It requires a new planning model in which every hectare of open soil becomes a resource worth defending.