Except maybe (insert 3-5 diminutive adjectives here) the diaper bowl, these are all extremely unviable. Wasting hundreds of dollars of machinery to collect the

Except maybe (insert 3-5 diminutive adjectives here) the diaper bowl, these are all extremely unviable. Wasting hundreds of dollars of machinery to collect the insignificant amount of heat energy given off by a human (especially in its resting state) is not very effective. As for plants, really? Plants are, being created by evolution for the purpose of spreading, not converting CO2 to O2, are not very efficient - there are machines that do the job much better. Also, the plants have to be fed food and water, making the thing extremely bulky and reducing fuel efficiency.