% reductions 1 Amino acids 1 China 1 Climate change 1 Cropping system 1 Cropping systems 1 Crops 1 Cultivation 1 Energy efficiency 1 Energy inputs 1 Energy utilization 1 Food supply 1 Glycine max 1 Grain (agricultural product) 1 Groundwater 1 Groundwater consumption 1 Lolium 1 Nitrogen fixation 1 Non-renewable energy 1 North China Plain 1 Pisum sativum 1 Population statistics 1 Secale cereale 1 Solanum tuberosum 1 Spinacia oleracea 1 The North China Plain The north china plain 1 Triticum aestivum 1 WEFRI 1 Water energy 1