Setting a path to increasing nutrient use efficiency

摘要

Our Nutrient World, a report commissioned by the United Nations Environment Program (Nairobi, Kenya), describes how humans have altered the natural flows of nitrogen, phosphorus, and other nutrients. The report, which describes a study carried out by experts from 14 countries, recommends a 20% improvement in nutrient use efficiency by 2020, reducing the annual use of nitrogen fertilizer by 20 million Mg. The goal of "20:20 for 2020" would provide a net savings of about $144 billion/yr (£110 billion/yr), according to a Centre for Ecology and Hydrology (Wallingford, England) news release.