The Earth was once lush and temperate even near the poles due to a protective water vapor atmosphere which stopped the cosmic radiation that now leads to premature aging.
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Ancient underground tunnels cross most of South America. ( E.g. Near Lima, Peru is a subterranean road to Cusco, almost 400 miles to the east as well as a southern route more than 900 miles to the vicinity of Salar de Atacama.)
Changes in the ionosphere, 55 miles above us, are detectable days before earthquakes since huges stresses along faults generate positive charges that ionize the atmosphere.