Forests, which are home to 80% of Earth's biodiversity, are shrinking by 13 million hectares per year. More than 75% of the planet's land surface has already been altered in a more or less reversible way, leading to desertification, deforestation, pollution and salinisation. At the current rate, experts at the IPBES (Intergovernmental Platform on Biodiversity and Ecosystem Services) estimate that 95% of the planet's land may deteriorate by 2050, which could provoke massive population displacements.