Overview

• Under a +2 °C warming scenario, the report projects a 13% rise in the fiercest cyclones and up to one metre of sea-level increase by 2100.
• Droughts are expected to become longer and more intense, with aging water networks wasting between 35% and 63% of supply across the territories.
• Socio-economic fragilities are stark, with poverty affecting 77% of Mayotte’s population, 53% in Guyane and 42% in La Réunion compared with 14.4% nationally.
• Accelerated coral reef decline — 70% already damaged in Guadeloupe — threatens marine biodiversity, fisheries and coastal defences.
• The report urges France to boost climate finance, implement locally tailored adaptation measures and secure dedicated overseas territory representation at COP30.