efficiency is achieved efficiency is high efficiency is important efficiency is increased efficiency is low efficiency is measured efficiency is obtained efficiency is one efficiency issues efficiency label efficiency level efficiency levels efficiency loss efficiency losses efficiency management efficiency market efficiency may efficiency means efficiency measures efficiency must efficiency needs efficiency of agricultural efficiency of air efficiency of buildings efficiency of data efficiency of different efficiency of energy efficiency of existing efficiency of health efficiency of heat efficiency of justice efficiency of operations efficiency of power efficiency of production efficiency of public efficiency of solar efficiency of the device efficiency of the engine efficiency of the method efficiency of the process efficiency of the solar efficiency of the system efficiency of water efficiency performance efficiency plan efficiency potential efficiency power efficiency program efficiency programme efficiency projects efficiency rate efficiency rating efficiency ratings efficiency ratio efficiency reasons efficiency reduces efficiency report efficiency requirements efficiency savings efficiency services efficiency solar efficiency standard efficiency standards efficiency strategy efficiency targets efficiency technologies efficiency test efficiency using efficiency varies efficiency when efficient efficient absorption efficient access efficient administration efficient administrative efficient agricultural efficient air efficient algorithm efficient algorithms efficient allocation efficient allocation of resources efficient alternative efficient and accessible efficient and accurate efficient and affordable efficient and clean efficient and cleaner efficient and competitive efficient and convenient efficient and cost effective efficient and cost-effective efficient and easy efficient and economic efficient and economical efficient and effective efficient and effective management efficient and effective use efficient and environmentally efficient and environmentally friendly