Sustainability is one of the favorite words uttered by those with the green, clean, free energy agenda. Just remember, anything is sustainable until its not. The average male Homo sapien living in the west is sustainable for about 75 years. Females get another 5 years. The average sustainable life span for hummingbirds is 3-5 years. At the margins, depending on what is invested in boosting those life spans, you might get a few years extra. There is nothing mysterious about sustainability, but the greens think the word has magic. Take a close look at the cost of electrons produced by sunshine and breezes in America. Can we afford all that sustainability? The poor cannot, nor can the middle class, as Australians have discovered and voted out the politicians pushing clean, green, cheap electron subsidies.