
Original: «How long can men thrive between walls of brick, walking on asphalt pavements, breathing the fumes of coal and of oil, growing, working, dying, with hardly a thought of wind, and sky, and fields of grain, seeing only machine-made beauty, the mineral-like quality of life?».
Fuente: Citado en: Is It Hot in Here?: The Simple Truth About Global Warming http://books.google.es/books?id=5sVccxbp2KgC&pg=PA143. Nathan Todd Cool. iUniverse, 2006. ISBN 0-595-40622-X, pág. 143.