So, if you use green disposable diapers, there is very little you end up doing with them except send them to a landfill when they are, um, filled.
Enter the Rentable Baby Diaper Digester. Clearly there is a lot of stink going on, and that might mean enough methane to capture and make usable. The rentable contraption would let you put all your diapers in this big sealed bin where there would be a bacterial slurry at the bottom that would help eat the compostable diapers while off-gassing methane. The methane would be trapped and eventually compressed for off-site use. The diaper slurry would eventually become compost. Bonus points if you use the methane or compost on your own property.