SAN FRANCISCO, May 12 /PRNewswire-FirstCall/ -- Digital Realty Trust, Inc. (NYSE: DLR), the world's largest wholesale datacenter provider, has released the results of its annual study of green datacenter trends in the United States. The new study indicates that significant shifts have occurred over the past 12 months in corporate green datacenter strategies. The study is based on a detailed survey of senior decision makers at large U.S. corporations who are responsible for their companies' datacenter and green IT strategies. The research was conducted for Digital Realty Trust by the respected research firm Campos Research & Analysis. "What dominated last year's study was the need for clearer standards and best practices for green datacenters. There has been significant progress in that area over the past year, including the publication of green datacenter case studies by industry leaders, the development of green building standards specifically for datacenters, and widespread efforts ...