The 100th Meridian has shifted 140 miles east

The iconic “100th Meridian” (The Line of Aridity), the North American climate boundary that visibly separates the humid eastern part of the continent from the more arid western plains, has shifted 140 miles east since 1980.


Af - Tropical rainforest climate, Am - Tropical monsoon climate,Aw - Tropical savanna climate, BSh - Hot semi-arid climates, BSk - Cold semi-arid climates, BWh - Hot desert climates, BWk - Cold desert climates, Cfa - Humid subtropical climate, Cfb - Oceanic climate, Cfc - Subpolar oceanic climate, Csa - Hot-summer Mediterranean climate, Csb - Warm-summer Mediterranean climate, Cwa - Humid subtropical climate, Cwb - Subtropical highland oceanic climate, Dfa - Hot humid continental climate, Dfb - Warm humid continental climate, Dfc - Subarctic climate, Dfd - Subarctic climate, Dsa - Hot humid continental climate, Dsb - Warm humid continental climate, Dsc - Subarctic climate, Dwa - Humid continental climate, Dwb - Warm humid continental climate, Dwc - Subarctic climate, ET - Tundra climate.

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Ecoclimax is defined by Odum (1969) as the culmination state after a succession in a stabilized ecosystem in which maximum biomass (or high information content) and symbiotic function among organisms is kept per unit of available energy flow.