The NT total tends to rise over time due to (1) expanding Red List coverage and re-assessments that newly identify "almost threatened" species, (2) continued habitat loss, overexploitation, and climate-related pressures that push some species from Least Concern into NT, and (3) relatively fewer rapid recoveries that would move species out of NT compared with the rate at which new or worsening cases are added. Some NT species also transition into threatened categories, but the overall NT count still often increases as additional taxa are evaluated and as pressures intensify across many regions.
Geographic Patterns: NT species are disproportionately concentrated in high-biodiversity, high-pressure areas: tropical forest regions (e.g., Southeast Asia, parts of the Amazon and Andes, Central Africa, Madagascar), island systems with endemics (e.g., Indonesia/Philippines, Caribbean, Pacific islands), and coastal/marine biodiversity hubs (e.g., the Coral Triangle, Western Indian Ocean, parts of the Mediterranean). Freshwater NT species often cluster in heavily modified river basins and lake systems where pollution, water extraction, dams, and invasive species are intense.