The topic made me to read the whole post as I was curious to know those alternatives and thinking whether they can be researched on for further studies. I read all through and I wasnt disappointed. Those alternatives mentioned are all what I'm getting to know for the first time and I'm satisfied to have learnt from this post.
I don't know that human urine could be used as an alternative to energy. What we consider waste can actually be renewed.
Well-done!!