Information and Communication Technologies information and communication technology CO 2 emission 2 CO2 emissions 2 Carbon dioxide 2 Commerce 2 Economic and social effects 2 Economic growths 2 Energy conservation 2 Energy management systems 2 Expansion 2 Gross domestic products 2 OECD countries 2 Pooled mean group 2 Renewable electricity 2 Renewable energies 2 Smart city 2 Technology usages 2 Trade openness 2 gross domestic product 2 pooled mean group 2 renewable energy 2 smart city 2 technology adoption 2 trade openness 2 Aggregates 1 City residents 1 Climate change 1 Contextualize 1 Cost effectiveness 1