Totally true that what is and is not sustainable is more complicated than it first appears. I think what I'm honing in on is the idea that hand cranks produce

Totally true that what is and is not sustainable is more complicated than it first appears. I think what I'm honing in on is the idea that hand cranks produce very limited, often interrupted power and are relative low-tech, both of which are directionally the right way for us to be putting our efforts.