Climate Migration and Displacement

Climate migration and displacement is the most contested effect on this list because it entangles climate with conflict and economics. The World Bank projects up to 216 million internal climate migrants by 2050, but that figure could drop to 44 million with strong action. This range is 4.9 times wider than the margin for sea-level rise projections, making it the hardest to pin down. Unlike #7 (Extreme Weather), which has attribution data, migration lacks a single concrete event as proof—a difference that sparks heated debate. A 2020 study found that 40% of people displaced by weather events never cross a border, further muddying definitions. The authoritative view: while climate is a threat multiplier, precise numbers remain speculative, and the term 'climate refugee' is not legally recognized.