UN Adopts Equal Earth Map to Replace Mercator Projection

Representing the Earth on a flat surface is one of the oldest problems in geography. The Earth is not a perfect sphere. It bulges at the equator due to its rotation, and the gravitational pull of the Moon and the uneven distribution of continents and oceans further distort its shape. The most accurate three-dimensional model is called a spheroid, derived from an ellipse. Because carrying a globe is impractical, cartographers developed map projections: mathematical methods to transform a three-dimensional surface onto a two-dimensional plane.

Every projection must sacrifice accuracy in at least one of four properties: area (relative size of landmasses), shape (true outline of a country or continent), distance (actual space between two points), and direction (correct compass bearing). No single flat map can preserve all four simultaneously. This is the fundamental constraint of cartography, and it is why different projections exist for different purposes. Projections are broadly classified as conformal (preserving angles and shapes), equal-area (preserving relative sizes), equidistant (preserving distances), and compromise projections (balancing all distortions without perfectly preserving any one).

The Mercator projection, created in 1569 by Flemish cartographer Gerardus Mercator, became the world's dominant map for over four centuries. It was designed specifically for maritime navigation. By the 19th century, it had become the standard for atlases, classroom wall maps, and eventually digital mapping platforms. Generations of students worldwide formed their mental image of the globe through a map originally built for sailors. Africa, the world's second-largest continent at approximately 30.3 million sq km, appears roughly the same size as Greenland on a Mercator map, even though Africa is about 14 times larger than Greenland. This distortion is directly tied to how latitude spacing works: on the Mercator map, the distances between lines of latitude increase as one moves toward the poles, inflating the apparent size of high-latitude regions such as Europe, North America, and Greenland relative to equatorial regions. The same geometric principle that explains why the Arctic Circle experiences continuous daylight on 21 June, Earth's axial tilt and the geometry of latitude, also explains why polar regions are disproportionately stretched on a Mercator grid.