Watch the movie below  and write a summary (between 250 and 500 words) addressing the following points:

What problem(s) does the author of the documentary try to solve?
What sources of energy does the author discuss in the documentary? 
What was the most interesting part of the documentary?
What was the most surprising thing you learned from this documentary?

https://www.youtube.com/watch?v=RvaE0PFna84 this is the video