energy - history and future

odkazy na zajímavá videa:
How the fossil fuels were made?-
Where the energy comes from? - 5minutes, easy (jednoduché)

Electricity from all kinds of renewable sources 

Solar Energy - Physics Project - 45 minutes, difficult, voice and text

Wind Power - 10 minutes - nice english, medium, easy to understand )jednoduché pro porozumnění)