One of the factors which set humans apart from any other species is the capability to think critically and develop new and innovative ideas to resolve environmental problems. After reading the article by Meg Carter, describe some of the practical applications of non-mainstream (that is, human power) energy sources. Do you believe that these are viable energy options in big scale operations? Small scale operations? Describe one other non-mainstream option which might have practicality in energy production? (Hint: If you are not able to find any through the Internet, look at the suggested readings).