renewable systems / dairy products / sufficient greenhouse gas emissions reductions / energy demand / greenhouse gas emissions / renewable energy generation technologies / reduced energy demand / energy systems / zero carbon energy supply / Smart demand management / electricity / food group balance / non-energy processes / variable energy supply / neutral synthetic gas / energy system / generation energy crops / gas power stations / greenhouse gas emissions targets / wood products / renewable electricity supply / food production / food sources / surplus electricity / short-term energy storage / Present gas infrastructure / synthetic gas / dispatchable energy / renewable electricity generation technologies / transport systems / food / energy / /