1. Energy resources and use: The present situation and possible paths to the future☆
2. Perspectives for the Energy Transition: Investment Needs for a Low-Carbon Energy System;International Renewable Energy Agency,2017
3. European Commission, Energy, Climate Change, Environment. Climate Action. EU Action. Climate Strategies & Targets. 2050 Long-term Strategy, https://ec.europa.eu/clima/policies/strategies/2050_en.
4. European Commission, Energy, Climate Change, Environment. Climate Action. EU Action. Climate Strategies & Targets. 2030 Climate & Energy Framework, https://ec.europa.eu/clima/policies/strategies/2030_en.
5. Lessons from nature about solar light harvesting