This is really really cool, and these three girls are awesome. First off they're from Nigeria, land of the desperate and home of the crazy, so props just for staying normal. Second they're High Schoolers--one's s only 14--and third it's thinking like this that could save our stupid species.
Nature (a.k.a. the gods) abhor waste. Modern humans thrive on it. To bring ourselves in line with the gods' demands offers our one (slim) chance to survive. Power generated from our own waste products = WIN!
Lotta commenters sour grape that these kids' science project can't solve the World's Energy Crisis®. Them I ask "and in High School YOU perfected what besides ways to masturbate?"
This is way better than it seems.