The “Green World Colouring App” introduces global warming and renewable energy in a fun and accessible way for children. The different sources of renewable energy including wind, water, geothermal, solar and bioenergy are introduced and a short educational message accompanies each colouring page explaining the underlying concepts. A number of useful tips are also provided to encourage children use less electricity on daily basis. When colouring pages are finished, it is possible to print them directly from the app or easily share them online.