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Dave Clark, Amazon senior vice president of worldwide operations and customer service, said in a news release at the time that the company is “excited to supplement our existing delivery network with a great new provider, ATSG, by adding 20 planes to ensure air cargo capacity to support one and two-day delivery for customers.”

Declining land productivity also makes societies more vulnerable to social instability - particularly in aid areas, where "years with extremely low rainfall have been associated with an increase of up to 45 percent in violent conflict," Scholes said.

Dai: The vandal cases are isolated. Ofo appeals to its users to remember others, especially by parking bikes in the right place. We at the same time have increased our operational staff to ensure supervision. The staff check the condition of the bikes and their parking.

Dave Limp, Amazon senior vice president of devices and services, shows off Amazon’s newest devices. (GeekWire Photo / Nat Levy)

Data showed that volunteer activities organized by women's federations at various levels have benefited around 7.3 million children and parents.