Solar Power in Germany:

“Solar power” by tillwe is licensed under CC BY-SA 2.0 .

Wind Energy in Denmark:

“File:Model Wind Turbine Farm, Copenhagen, Denmark (7103048007).jpg” by tsaiproject from Canada is licensed under CC BY 2.0 .

Hydropower in China:

“Dujiang-Wiers hydraulic project, China” by Global Water Forum is licensed under CC BY 2.0 .