1. Renews Kompak: Opinions on Renewables–A Look at Polls in Industrialized Countries;German Renewable Energies Agency,2016
2. Climate Change Report; Special Eurobarometer 409;European Commission,2014
3. Public Divides Over Environmental Regulation and Energy Policies;Pew Research Center,2017
4. Cheap and Clean: How Americans Think About Energy in the Age of Global Warming;Ansolabehere,2014
5. World Development Indicators;World Bank,2014