OTH, electricity from humidity gradients could be one of those things that seems to work great in the lab on an eensy-teensy scale but no one ever really finds a way to make it practical on a commercial consumer or industrial scale. Since the gene for the Geobacter nanowire protein has been cloned, maybe genetic engineering can find a way to make the protein even more adaptable to human purposes. Roger Tsien shared a Nobel Prize in 2008 for his work on the jellyfish green fluorescent protein (a.k.a., GFP) for engineering different protein variants that would glow different colors (useful for creating multiple gene tags to view at same time in cell biology work) and just this past year a renowned woman chemist at Cal Tech, Frances Arnold, claimed a 50% share of the Nobel Prize in Chemistry along with Greg Winter and George P. Smith, for working out techniques to greatly accelerate the evolution of cloned protein genes in a test tube, making novel new protein activities that Nature never thought of. So perhaps such engineering could be used to improve electricity-generating protein nanowires. Near-room temperature superconductivity is making some amazing advances, too, at closer to atmospheric pressures. So I hope humans are smart enough to take all this stuff to the next level.