Investments Renewable energies 8 Economics 5 Climate change 4 Environmental technology 4 Renewable energy resources 4 renewable energy 4 Carbon dioxide 3 Economic and social effects 3 Energy policy 3 Fossil fuels 3 Solar power generation 3 CO 2 emission 2 CO2 emissions 2 Coal 2 Cost benefit analysis 2 Costs 2 Economic analysis 2 Economic growths 2 Energy 2 Energy transitions 2 Energy utilization 2 Foreign direct investments 2 Greenhouse gases 2 Nuclear 2 Photovoltaic systems 2 Power 2 Renewable energy 2 Sensitivity analysis 2 Solar energy 2