“…Given the time and budget constraints, we decided to give up sampling all provinces in China. Instead, we invited scholars with backgrounds or experience in energy economics, agriculture economics, statistics, and field survey to discuss proper sampling selection strategy, and eventually selected 12 representative provinces that vary substantially in terms of energy types, spatial location, climatic conditions and socioeconomic indicators (Wu et al, 2017). These provinces include Hebei, Heilongjiang, Jiangsu, Zhejiang, Fujian, Hubei, Hunan, Guangdong, Sichuan, Yunnan, Shaanxi, and Gansu.…”