1. European Commission. Energy efficiency and its contribution to energy security and the 2030 Framework for climate and energy policy. Communication from the Commission to the European Parliament and the Council. COM520. Brussels; 2014.
2. United Nations. Sustainable development goals. 17 goals to transform our world; 2016. 〈http://www.un.org/sustainabledevelopment/climate-change-2/〉 [Accessed 3 May 2017].
3. United Nations framework convention on climate Change; 2014. 〈http://unfccc.int/2860.php〉 [Accessed 3 May 2017].
4. Stern review on the economics of climate change;Stern,2006
5. International Energy Agency. Energy efficiency indicators. Paris, 〈https://www.iea.org/publications/freepublications/publication/EnergyEfficiencyIndicatorsHighlights_2016.pdf〉 [Accessed 26 March 2017]; 2016.