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2. World Urbanization Prospects: The 2018 Revision (ST/ESA/SER.A/420),2019
3. EU Strategy on Heating and Cooling. European Parliament Resolution of 13 September 2016 on an EU Strategy on Heating and Cooling. Official Journal of the European Union, P8_TA(2016)0334https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX%3A52016IP0334
4. Changes of heating and cooling degree-days in Europe from 1981 to 2100
5. Statistics Explained: Renewable Energy Statistics. Over one Fifth of Energy Used for Heating and Cooling from Renewable Sourceshttps://ec.europa.eu/eurostat/statistics-explained/index.php/Renewable_energy_statistics#Renewable_energy_produced_in_the_EU_increased_by_two_thirds_in_2007-2017