1. European Commission, Energy, transport and environment indicators. Eurostat (2012).
2. IPCC, Climate Change 2007: Synthesis Report. Contribution of Working Groups I, II and III to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change (2007) 144 pp.
3. 2020 Climate and energy package—European Commission, https://ec.europa.eu/clima/policies/strategies/2020_en (2017).
4. 2030 Climate and energy framework — European Commission., https://ec.europa.eu/clima/policies/strategies/2030_en (2018).
5. European Commission, Directive 2012/27/EU on Energy Effciency (2012).