A 2000 study on Webvan, a now defunct (已废止的) U.S. online grocer, concluded that a wider adoption of e-commerce would not give us environmental gains, while a 2002 study of US book retailing found no greater energy savings selling online. But the study that all e-tailers are talking about is a new one from Carnegie Mellon University, which has found that shopping online via Buy.com ’ s e-commerce model for electronic products uses 35% less energy consumption and CO2 emissions that a traditional bricks-and-mortar model. We can learn from the paragraph that _____.