1. http://www.footprintnetwork.org/en/index.php/GFN/page/world_footprint/.
2. http://ec.europa.eu/energy/index_en.htm.
3. EBC, Methodology for Cost-Effective Energy and Carbon Emissions Optimization in Building Renovation (Annex 56), August 2014, available in http://www.iea-annex56.org/.
4. http://ec.europa.eu/energy/observatory/trends_2030/index_en.htm.
5. IEA, http://www.worldenergyoutlook.org, International Energy Agency.