WASHINGTON Will Fuller V Color Rush Jersey , March 10 (Xinhua) -- The expansion of the Mongolian empire in the 1200s may have been supported by a warm and unusually wet climate that likely spurred grassland productivity, U.S. researchers studying the rings of ancient trees in mountainous central Mongolia said Monday.
Some researchers have postulated that the Mongols expanded because they were fleeing harsh weather at home, but Neil Pederson, a tree-ring scientist at Columbia University's Lamont-Doherty Earth Observatory, and his colleagues found the opposite.
Pederson and coauthor Amy Hessl Julien Davenport Color Rush Jersey , a tree-ring scientist at West Virginia University, reconstructed a 1,112-year rainfall record from 900 to 2011 using tree rings from Siberian pine trees in central Mongolia.
The record showed that exactly when the empire rose, the normally cold, arid steppes of central Asia saw their mildest D'Onta Foreman Color Rush Jersey , wettest weather in more than 1,000 years.
The unusual period of high moisture between 1211 and 1225 may enhance grassland productivity, providing Genghis Khan's empire with ample energy and the resources to support a culture based on horses and other livestock, the researchers said.
The record also showed that the years preceding Genghis Khan's rule were stoked by intense drought from 1180 to 1190.
"The transition from extreme drought to extreme moisture right then strongly suggests that climate played a role in human events, " said Hessl.
"It wasn't the only thing Zach Cunningham Color Rush Jersey , but it must have created the ideal conditions for a charismatic leader to emerge out of the chaos, develop an army and concentrate power. Where it's arid, unusual moisture creates unusual plant productivity, and that translates into horsepower. Genghis was literally able to ride that wave," Hessl said.
Previous studies often link detrimental climate conditions such as drought with the decline of complex societies Deshaun Watson Color Rush Jersey , such as the disappearance of the Maya, the fall of Roman imperial power and the 13th-century collapse of southeast Asia's Angkor civilization.
The new study, published in the U.S. journal Proceedings of the National Academy of Sciences, however, is one of the few to explore the more complex question how climate might have invigorated one.
RIO DE JANEIRO Texans Texans Tyler Ervin Jersey , March 1 (Xinhua) -- Tickets for Brazil's World Cup qualifier against Uruguay at the Arena Pernambuco in Recife later this month have sold out.
The match is the fifth qualifier ahead of the 2018 FIFA World Cup, to be held in Russia.
All 44, 739 tickets that were put on sale by the Brazilian Football Confederation (CBF) sold out in just four days.
According to Brazilian daily newspaper Folha de Sao Paulo, the CBF could put tickets up for resale on 5 March, should cancellations be made.
The match will mark the return of Barcelona striker Luis Suarez following a nine-game ban for biting Italian defender Giorgio Chiellini at the 2014 FIFA World Cup.
Uruguay currently sit in second place in the South American World Cup qualifying group with nine points Texans Texans Braxton Miller Jersey , three behind surprise leaders Ecuador, who boast a 100 per cent record. Brazil are in third place with seven points.
National coach Dunga will name his squad for the match on Thursday.
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