An Input–Output Analysis of the Water–Energy–Food Nexus Based on the Intensity and Quantity Index System—A Case Study of 30 Provinces in China

In the study of water–energy–food nexus (WEF nexus), importance intensity and quantity index system has been widely recognized. order to impact WEF on economy, this paper establishes an a system, taking account environmental pollution. Using DEA model China’s provincial data from 2019, calculated efficiency with developed systems. The results show that is not high in areas economic development level, lowest relatively low level. When considering pollution, some provinces increased significantly, indicating caused damage conducive sustainable development. two systems, production significantly lower than consumption there serious waste cultivated land per capita. Compared low, polarization obvious. A level GDP does mean There may be resource utilization technology or pollution underlying it. It unscientific evaluate local only by GDP. evaluating urban economy national we should conduct overall reasonably allocate resources, which will help alleviate current situation shortage various countries but also effectively promote coordinated regional economies. At same time, protection taken into account. developing first then solving problems, at time more economy.