It is estimated that 25% of all methane that released into the atmosphere coming from farm animals.
出自-2013年6月听力原文
Yet due to poor practices in harvesting, storage and transportation, as well as market and consumer wastage, it is estimated that 30-50% of all food produced never reaches a human stomach.
出自-2013年12月阅读原文
Interest in this aspect of the settlement has focused on "orphan" works, where there is no known copyright holder – these make up an estimated 5-10% of the books Google has scanned
出自-2011年12月阅读原文