Wall Street Journal: Now and then across the centuries, powerful voices have warned that human activity would overwhelm the earth’s resources. The Cassandras always proved wrong. Each time, there were new resources to discover, new technologies to propel growth. Although a Malthusian catastrophe is not at hand, the resource constraints foreseen by the Club of Rome are more evident today than at any time since the 1972 publication of the think tank’s famous book, "The Limits of Growth." Steady …