I've seen alternative & sustainable energy technology evolve tremendously in my lifetime, and yet I know there are applications, like hydroelectric energy, that continue to be valuable contributors to our world. One that, sadly, has diminished mightily in most of our eyes, is the water-pumping windmills. At one time they were spread widely across our country, but now they are mostly broken, non-functional, and rusty relics seen here-and-there.