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The northern regions were situated in the temperate climate zone, while the rest of Italy was in the subtropics, having a warm and mild climate. [1] During the annual melt of the mountain snow, even small rivers would overflow, swamping the terrain ( Tuscany and the Pontine Marshes were deemed impassable in antiquity). [ 1 ]
The Roman Warm Period, or Roman Climatic Optimum, was a period of unusually-warm weather in Europe and the North Atlantic that ran from approximately 250 BC to AD 400. [1] Theophrastus (371 – c. 287 BC) wrote that date trees could grow in Greece if they were planted but that they could not set fruit there.
The Clean Air Act is passed in the United States, with subsequent amendments in 1970, 1977 and 1990. 1974 World population reached 4 billion. [23] 1970s 2010s Deindustrialization occurs in the Midwest and then much of the United States, as manufacturing industries (and their pollution) move to China and other Asian countries. 1980
Older Peron warm and wet, global sea levels were 2.5 to 4 meters (8 to 13 feet) higher than the twentieth-century average 3900: 5.9 kiloyear event dry and cold. 3500: End of the African humid period, Neolithic Subpluvial in North Africa, expands Sahara Desert 3000 – 0: Neopluvial in North America 3,200–2,900: Piora Oscillation, cold ...
Rome and its metropolitan area has a Mediterranean climate (Köppen climate classification: Csa), [1] with mild winters and hot summers. According to Troll-Paffen climate classification, Rome has a warm-temperate subtropical climate (Warmgemäßigt-subtropisches Zonenklima). [2]
The Hadley cell is a closed circulation loop which begins at the equator. There, moist air is warmed by the Earth's surface, decreases in density and rises. A similar air mass rising on the other side of the equator forces those rising air masses to move poleward. The rising air creates a low pressure zone near the equator.
Dr Stephen Burt, a meteorology expert, said the sudden change in temperatures has been caused by tropical air travelling up from the Madeira area. Warm air from Madeira causes 'extraordinary ...
Rains washed away the unprotected earth and greatly altered coastlines, in some cases, pushing them many miles farther out to sea as in the case around the mouths of the Po River. [15] The washing away of topsoil and deposits of silt and gravel meant that harbors and ports needed to be moved, causing further burden upon the economy.