Comment by _ache_

Oh! Good point, we may not have the same definition of usefulness.

By useful I mean, to the world. That it affect the world in a good way. Maybe it's not the best technology to do something but replace the best way in an CO2 effective way. Maybe it is not a clean technology but increase overall fairness.

I don't know, but it had to have a good income to the world in a way.